JPS61167933A - Camera system capable of operation diagnosis - Google Patents

Abstract

PURPOSE:To take a fault diagnosis and an inspection while putting the whole system in operation by transmitting data forth and back between a circuit part such as a camera control circuit and a control circuit composed of a microcomputer, etc., through a common data bus in time series. CONSTITUTION:The control microcomputer BMC of a camera body transmits and receives data to and from all other circuits through terminals SOU, SIN, and SCK for series input and output. Those series input and output terminals are monitored while this system is put in operation and read data are contrasted with the operation of the camera system to check whether the system operates normally or not. A checker side outputs a low-impedance 'Low' signal to hold a signal line CSB forcibly at a level 'Low', and then a gate circuit G2 is invariably active, so data transmission and reception to and from circuits except a back circuit BCKC are checked. Further, the back circuit BCKC is checked from a lens circuit LEC through terminals T12 and T13 to some extent. Consequently, the camera is diagnosed from outside while the camera is put in operation and a check is made even when the camera is completed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides, for example, a lens circuit section for supplying photographing lens data to a camera body, a circuit section for automatic focus adjustment, and a circuit section for supplying various data. The display circuit section for displaying the display, the flash circuit section for flash photography, and the camera back cover for recording shooting data, shooting date and time, etc., and for shooting at regular intervals based on the settings on the camera back cover. The present invention relates to a camera system that operates while exchanging data between a circuit section such as a circuit section provided on the camera back cover and a control circuit such as a control microcomputer within the camera body.

Hesitation! In the past, when a failure occurred in a camera system such as the one mentioned above, it was necessary to check each circuit section in the system individually to find out which part had failed, so it was difficult to diagnose the failure. The problem was that it was time-consuming, the work was complex and required a high level of skill, and the cost was high. This was also the case when inspecting the camera during the camera assembly process. Further, by checking individual circuit sections, it is impossible to perform failure diagnosis or inspection while operating the entire camera system.

SUMMARY OF THE INVENTION An object of the present invention is to provide a camera system in which failure diagnosis and inspection can be easily performed while the entire system is operating.

To achieve this objective, the present invention provides a lens circuit section for providing photographing lens data to the camera body, a circuit section for automatic focus adjustment, and a display section for displaying various data. The display circuit for flash photography, the flash circuit for flash photography, and the camera on the camera back cover? ! Data exchange between a circuit such as an IJ control circuit and a control circuit such as a microcomputer inside the camera body is performed in chronological order via a common data bus, and this data bus is
It is characterized by being connected to a back cover terminal provided on the camera body for data exchange between the camera body and the camera back cover.

艷-1 With this configuration, it is possible to monitor the transmission and reception of signals in the camera system from the back cover terminal and diagnose the operation of the camera system.

FIG. 1 is a block diagram showing the entire camera system to which the present invention is applied. The part (BD) surrounded by a broken line is the camera body, and it is electrically connected to the camera body (BD) from the terminal (T1).
(BCKC), which is connected via (T,), has data imprinting function, interval shooting function, camera body (
This circuit has a calculation function for exposure control of the camera (BD).This circuit is installed on the camera back cover, and from now on, this circuit (BCKC)
) is called a buck circuit, and this buck circuit (BCKC
) is installed on the camera back cover (BCK)
It is called.

This back (BCK) is replaceable and detachable from the camera body (BD), and the camera body has a back cover that is equipped with circuits that only have data imprinting functions and interval shooting functions, and It is also possible to attach a back cover that is not provided with a circuit having the functions of 1 to 3 in place of this back (BCK).

Note that the configuration and function of this buck (B CK ) and the buck circuit (BCKC) will be described later.

Switches (S, ) and terminals (T, O) on the camera body (BD)
) is a motor drive device (hereinafter simply referred to as the motor drive), and when the exposure control operation is completed and the switch (S, ) is turned 'ON', the motor drive (MDR) ) starts rotating, and a mechanical interlocking mechanism performs film winding and charging of the exposure control mechanism. When charging is complete and the switch (S, ) is turned OFF, the motor drive is turned off. The rotation of the motor in (MDR) stops. This motor drive (MDR) is attached to the bottom of the camera body via a coupling mechanism, and when this motor drive is not attached, charging of the exposure control mechanism and film winding are performed by a manual winding lever. Note that this motor drive (MDR) is connected to the camera body (BD
) may be provided.

Camera body (BD) and terminal (T I+) - (T I'2
), (T 1s) is a data output circuit provided in the interchangeable lens. This circuit (LEC) is electrically connected by attaching the interchangeable lens to the camera body. Then, when the terminal (C3L) of the camera body becomes "Low", it enters the operating state, and various data unique to the interchangeable lens are sequentially output in series based on the reading clock pulse from the camera body (BD). This data includes data for confirming attachment of an interchangeable lens, open aperture value data, maximum aperture value data, focal length data, characteristic data for automatic focus adjustment, and the like. Details of this circuit, data, etc. are described in, for example, Japanese Patent Laid-Open No. 59-84228 and Japanese Patent Laid-Open No. 59-140408, and will therefore be omitted.

(MET) is a light meter (hereinafter referred to as a meter) that connects the camera body (BD) and terminals (T,,), (T +s)*(
The circuit (REC) connected at T, s) is a receiver that receives the infrared light signal sent from the meter (MET).

In addition, the receiver (RFC) and the terminal (T + tL (T
, l).

The circuit (FL) connected to (T, s) is a flash device. The receiver (REC) is the camera body (BD
) is attached to the hot shoe of the receiver (R
When the 7 lash device (FL) is attached to the hot shoe provided on the FC), the connection state shown in FIG. 1 is achieved. Note that only the receiver (RFC) or only the flash device (FL) may be attached to the hot shoe of the camera body (BD). Furthermore, the signal lines (s'r,), (s'r2), (S'
r 3) is provided with a terminal that is exposed to other parts of the camera body (BD) other than the hot shoe (for example, the bottom of the camera), and the 7 lash device (FL) and receiver are connected to the hot shoe.
One side of the (RFC) is attached directly, and the other part is equipped with a flash device (F, L) and a receiver (
REC) may be attached.

The meter (M ET ) can be used as an incident light type or a reflected light type, and is also capable of measuring steady light and flash light. Then, exposure control data is calculated based on the measured value, and this data is emitted as serial light data by the infrared light projection means. In addition to this, the data to be ejected is the flash device (FL)
Check the meter (M E
There is data indicating whether control data is being sent from T'J. Data from the infrared light sent from the /data (MET) is sent to the receiver (REC).
is read and latched as an electrical signal.

Next, the signal line (S T ,) + (S T 2) − (
The functions of the flash device (FL) and receiver (RFC) related to ST3) will be explained together with the functions of the camera body (BD). First, the terminal (ST,) is a terminal for transmitting a light emission start signal, and is located inside the camera body (BD). When the & point (SX) closes when the front curtain (IC) completes running, the 7 lash device (FL) starts emitting light.

When the receiver (REC) receives a test light emission signal from the meter (MET), the receiver (REC) pulls this terminal (ST+) to "Low" and starts the flash device to emit light. The signal line (ST,) is 7 from the camera body (BD)? For data transmission to Tsushie device (FL), flash device (FL), receiver (REC)
A bidirectional serial data bus for data transmission from to the camera body (BD), and a signal indicating that the
It has the function of transmitting information from the lash device (FL) to the camera body (BD).

The signal line (ST3) has a mode in which data is input from the flash device (FL) and receiver (REC) to the camera body (BD), and a mode in which data is output from the camera body (BD) to the 7 lash device (FL). The 7 lash device (
FL), receiver (RFC), and a function to transmit synchronization clock pulses for data exchange from the camera body (BD) to the flash device (FL) and receiver (RFC).
FC), and furthermore, the flash device (F
It has the function of transmitting the light emission stop signal (L) from the camera body (BD) to the 7 lash device (FL).

In the camera body (BD), the microcomputer (
(hereinafter referred to as microcontroller) (BMC), Ga line (CSF)
When set to ``Low'', the interface circuit (IF) becomes ready to send and receive data.Then, the camera body (
When the BD) inputs data, the microcontroller (BMC)
) outputs a pulse with a first time width to the signal line (FMO), this pulse signal is input to the flash device (FL) and receiver (RFC) via the signal line (ST3), and each outputs a data output signal. mode. When a clock pulse for reading data is output from the terminal (SCK) of the microcomputer (BMC), it is output to the signal line (ST, ) via the interface circuit (IF).

First, the flash device (FL) outputs 1 byte of data to the signal line (ST2), and this data is sent to the microcontroller (IF) via the interface circuit (IF).
BMC) data input terminal (SIN). This data includes a signal indicating whether the 7 flash device is exclusive to this system, a signal indicating whether the charging voltage of the main capacitor exceeds a predetermined value, a signal indicating whether the flash device is automatically dimmed, etc. be. 2
The 3rd, 3rd and 4th bytes are Reggie/E (R
FC), and this data is also output from the microcontroller (BMC).
is read from the data input terminal (SIN) of 27〈
The first data is a signal indicating whether exposure control data is being sent from the meter (MET), a test light emission signal, etc. The third byte is exposure time data from the meter (MET), and the fourth byte is print value data. When the above data input is completed, the signal line (C3F) becomes High.
h'', flash device (FL), receiver (R
FC) will no longer be exchanged with the FC.

When transmitting data from the camera body (BD) to the 7 lash device (FL), set the signal line (C8F) to “Low”.
``'' and outputs the pulse during the second time to the signal line (FMO).Then, the 7-latune device (FL) enters the data input mode, and the 7-latune device (FL) enters the data input mode based on the synchronization clock pulse from the 9-power camera body (BD). , reads 3 bytes of data from the data output terminal (SOV) of the microcomputer (BMC).The first byte of these 3 bytes is the control aperture value (
Av) and exposure control mode, the second byte is the sum of film sensitivity and exposure compensation data (S v + Cv)
, the third byte is the focal length (fv) of the interchangeable lens, and the data in the first and second bytes are data used to calculate and display the shooting distance range in which the appropriate JEIF light is compensated for by flash emission. Yes, the data in the third byte is data for adapting the irradiation range of the flash device (FL) to the photographing angle of view of the interchangeable lens.

When the camera body (BD) starts exposure control operation,
The signal line (CSF) is set to "Los" and a pulse during the third time is output to the signal line (FMO). Then, this pulse is read from the signal line (ST, ) by the 7 lash device (FL) and flash! 1ffi, (
FL) is the flash mode for exposure control. When the actual exposure control operation starts, “
The Lo-〇 pulse is output and the interface circuit (
IF) is a flash light amount control circuit (FLM).
Signal line (FST) from signal line (s T z)
The signal input from the circuit (FLM) via the line (FSP) is output to the signal line (ST3). The signal line (ST2) has 7 lash devices (FL
) until the light emission starts, keep the “Low” signal a,
When the flash device (FL) starts emitting light, the “High”
The light emission amount control circuit (FLM), which changes to 0, is equipped with a light receiving element that receives the subject light that has passed through the photographic optical system and has passed from the film surface, and is connected to a signal line (ST
i), (F s 'r) changes from 'High' to 'Lo
w'', the output current of this light-receiving element starts to be integrated.Then, the integrated value is transferred to the A-D, D-A converter circuit (A
When the film sensitivity (S V) and exposure compensation amount (Cv) input from DA) reach the value corresponding to the analog signal of data Sv + Cv, the signal line CFSP> becomes High.
h'' pulse is output, and this pulse is connected to the signal line (S
T,) is input to the flash device (FL), and flash emission is stopped.

Also, 7? When a pulse is input from the signal line (ST, ) for data exchange, the γ-shield device (FL) is able to perform a voltage boosting operation for a certain period of time (for example, 15 minutes) from the time when the pulse is input.

Therefore, every time data is exchanged with the camera body (BD), the voltage boosting operation is performed for a certain period of time from that point onwards.

When using this function for interval shooting with flash photography, a signal to start the camera body (BD) is input from the back circuit (BCKC) a certain period of time (for example, 1 minute) before the start of shooting. When the camera body (BD) is activated, data is exchanged with the 7 lash device (FL), and external pressure operation is performed. Therefore,
Even in interval photography using flash photography having intervals of 15 minutes or more, the main capacitor of the 7 lash device (FL) is fully charged before photography.

Above meters (MET), receivers (RFC)
, flash device (FL), interface circuit (I
F) A specific example of the flash light emission amount control circuit (FLM) is described in, for example, Japanese Patent Application No. 59-201381, and will therefore be omitted here. It also includes a flash device (FL), an interface circuit (IF), a flash light amount control circuit (F
In addition to the above-mentioned examples, specific examples of
This is also shown in Japanese Patent Application No. 59-48435.

Next, the inside of the camera body (BD) surrounded by broken lines will be explained. (BMC) is a microcomputer, and its operation is shown in the 70-chart in FIGS. 2 and 3.

(BA) is a power supply battery, and a photometry circuit (FLM) is connected directly from this battery (BA) via a power supply line (10E).

(AM) A-D, D-A conversion circuit (A D A ) is removed (power is supplied to the circuit. The transistor (BT) is the output capacitor of the microcomputer (BMC)) (OP o). ON", 'OF F' control, transistor (B
When T) is turned on, the photometry circuit (FLM), (AMM), A-D, D-A conversion circuit (
Power is supplied to the A D A L lens circuit (LEC). (DSP) is a display circuit that displays the photometry mode, exposure control mode, exposure time for control, aperture value for control, film sensitivity, exposure compensation amount, and the status of the flash device. Furthermore, when the exposure time and aperture value are out of control interlock, the exposure time and aperture value at the control limit blink and a warning is displayed. This display circuit (DSP) is connected to the signal line (C
3D) is set to “Loll”, the microcomputer (
BMC) data output terminal (S OV ) to the terminal (S
It reads serial data sent in synchronization with clock pulses from CK and performs display based on this data.

(AMM) is a photometry circuit for ambient light, and has a photodetector for partial photometry and average photometry.
) can be switched by "High" or "Low". This photometric circuit (AMM) outputs a voltage signal obtained by logarithmically compressing the output current of the light receiving element.

The A-D, D-A conversion circuit (ADA) is connected to the signal line (A
When a “Low” pulse is output to the microcontroller (BMC) terminal (CK
AD conversion is performed based on the clock pulse from OUT). *If the signal line (C8A) is “Low” (
When ADMO) is 'High', the A-D converted data is sent to the data input terminal of the microcomputer (BMC) in synchronization with the clock pulse from the terminal (SCK), and when the signal line (C3A) is 'Low', (A DMO) is “L”
ow", the data is read from the output terminal (SOV) as the above-mentioned data Sv+Cv, this data is D-A converted and output to the light emission control circuit (FLM). Note that the signal line (C3A) is " When it is “High”, data is not exchanged with the microcontroller (BMC). (G,
) is a date circuit, and the signal line (CS L) is “Lo”.
w”, it becomes possible to send data from the lens circuit (LEC) to the re-microcontroller (BMC), which becomes active. (AFC) is the automatic focus adjustment circuit, and the signal line (AFE) becomes active. When N ) becomes "Low", it becomes an operating state, and when it becomes "High", it stops operating.

Also, when the signal line (C8AF) is “Low”! 1 reads the automatic focus adjustment data from the microcomputer (BMC). A specific example of this automatic charcoal control circuit (AFC) is shown in, for example, Japanese Patent Application Laid-Open No. 140408/1983, so the details will be omitted.

(APG) is means for outputting a pulse in response to the movement of the aperture member of the aperture, and this pulse is input to a terminal (CKIN) of a microcomputer (BMC).

The pulse input to this terminal (CKIN) is
Based on this pulse, the data is input to the event counter in the MC and is subtracted from the preset data of the number of refinement stages. When the content of the counter reaches 0'', it means that the number of narrowing down stages has been narrowed down by the planned number of stages, and a counter interrupt is generated, a pulse for stopping narrowing down is output from the output capo (OP, 2), and the narrowing down operation is stopped.

(MGD) is a magnet circuit, and when a "Low" pulse is output to the signal line (RL), the release magnet operates, and the focusing operation and mirror-up operation are started. When a pulse of "Lo11" is output to the signal line (AP), the aperture magnet operates and the embossing operation is stopped. When a "Loe+" pulse is output to the signal line (IC), the leading curtain lock release magnet operates and the leading curtain starts running. When a "Low" pulse is output to the signal line (2C), the trailing curtain lock release magnet operates and the trailing curtain starts running.

What about (G2)? -) circuit, the signal line (C8B) is “L”
ow”, it becomes active and the buck circuit (BCKC
) and the microcontroller (BMC).

The signal line (CSB) has the function of activating the back circuit (BCKC), and when the camera body (BD) is in operation and you try to exchange data with the back circuit (BCKC), the back circuit (BCKC) is also in operation. Become. moreover,
The signal line (C3B) outputs a "Low" pulse when the trailing curtain starts running in order to prevent film winding when data is imprinted in the back circuit (BCKC). It looks like this.

When the back circuit (BCKC) receives this pulse, it stops the imprinting operation at a time corresponding to the film sensitivity data sent from the camera body (BD). Signal line (B
IO) sends data from the camera body (BD) to the back circuit (BCKC) when it is “H1gh” and is “Low”.
, the camera body (B
Send data to D).

A pulse for data imprinting is output to the signal line (rp). This pulse is output from the time when the exposure control operation starts, and has a time width corresponding to the film sensitivity.

The switch (Sl) is a photometry switch that is closed when the release button is depressed in the first step, and starts photometry calculation operation. Further, a signal line (BS, ) is inputted from the back circuit (BCKC) in parallel with this switch (Sl), so that the microcomputer (BMC) can also be started from the back circuit (BCKC). Buck circuit (BCKC)
The activation signal is input from the camera via the signal line (Bs+) when the back circuit (BCKC) is operated and the back circuit (BCKC) operates, and when the shooting operation is started during interval shooting as described above. There are two types: a case where the camera body is started to start boosting the pressure of the 7-7 flash unit (FL) one minute before the start of the pressurization;

The switch (G2) is a release switch that is closed by the second step of pressing down the release button.
) is closed, the exposure control operation is started.6 Also, a signal line (BS) from the buck circuit (BCKC) is connected in parallel with this switch (G2), and a signal line (BS) is connected in parallel from the buck circuit (BCKC) When performing interval shooting or shooting a predetermined number of shots with a fixed exposure value shifted from the proper exposure (hereinafter referred to as bracket shooting), a signal is sent to the camera body (B D ) to start the shooting operation. Furthermore, when shooting a predetermined number of frames (hereinafter referred to as the number of frames) during bracket shooting, the power is transmitted. J) It is prohibited from the A9FjJK (BCKC) side, and when the release switch (G2) of the camera body (BD) is turned "OFF", it is possible to move on to the next bracket shooting. Therefore, the back circuit (BCKC) checks the status of the release switch (G2) on the camera body (B
If it is set to "N", data that prohibits transition to exposure control operation is sent from the back circuit (BCKC) to the camera body (BD).

In addition, during interval shooting, the back circuit (BCK
In C), it is possible to set the shooting start time, the number of 7 frames, and how many times (hereinafter referred to as the number of groups) the shooting of the 7+/- frames is to be performed at what time and opening interval. Then, from the back circuit (BOKC), at the start time, “
A signal of "Low" is output to perform an exposure control operation.

When the photographing of one group is completed, the signal line (BS2) is closed to "High", the time is counted for the set time interval, and the remaining time is displayed. When the remaining time reaches 0 seconds, the signal line (B S 2
) is set to "Low" and images are taken for 7 frames. When the above operations are completed, the set interval shooting mode is canceled. In addition, the back circuit (BCKC)
Even if the camera is operating in the interval shooting mode, if the release switch (S2) of the camera body (BD) is closed, the set start time and time interval are ignored and the shooting operation is performed. In other words, even if the start time has not yet been reached, when the release switch (S2) is turned ON and the shooting operation starts, the back circuit (BCKC) will not operate the signal line (B S,
) is set to “Low”. Further, the same operation is performed when the release switch (S2) is closed before the set time interval has elapsed. Note that the number of photographing operations performed by the camera body (BD) is determined by counting the number of input pulses for data imprinting from the signal line (IP).

A switch (SMO) on the camera body (BD) is a switch for switching the exposure control mode.

The mode changes each time this switch (SMO) changes from OFF to ON. The camera's exposure control mode Y is program exposure (P mode), exposure time priority automatic aperture control (S mode), aperture priority exposure time control (A mode),
There is a manual setting mode (M mode) for exposure time and aperture.

Each mode changes in the order of P→A→M→S-, P... The switch (srs) is a switch for setting the film sensitivity, and every time this switch (srs) changes from "OFF" to "ON", the film sensitivity changes in steps of 1/3 Ev until the upper limit is reached. After “
When the switch (SIS) changes from "OFF" to "ON", it changes to the lower limit value, and when the switch changes from "OFF" to "ON" again, it increases again. (SOR) is the switch that sets the exposure compensation amount. So, this switch (SOR)
Every time changes from “OFF” to “ON”, 0 → 1/2 →
1 → 11/2 → 2 → 21/2 → 3 → 31/2 → 4 → -4
→-31/Z→-3→-21/2→-2→-11/2→
It changes in the order of -1/2 → 0. (ST) is a switch that sets the exposure time, and this switch (ST)
Each time the exposure time changes from F'' to ON'', the exposure time changes to the shorter side in IEv steps. And when in S mode,
32sec→16sec→8 see→・・・= −
+1/1000sec-+1/2000sec
c-+ 1/4000sec→32sec-e...
..., and when in M mode, 32s
ee→16sec→・・・・・・→1/2000sec
→1/4000sec→Pulp→32sec→・・・
It changes like this. Therefore, the pulp mode can be set by operating the switch (ST) in the M mode. The switch (SA) is a switch that sets the aperture value, and this switch (SA) changes from "OFF" to "O".
When the mode changes to “N”, the mode is 1/2 when the mode is A or M mode.
The aperture value changes from the open aperture value to the maximum aperture value in the Ev step. When the maximum aperture value is reached, the aperture value changes to the maximum aperture value. The above switches (S M O), (S I
S), (S,OR)t(ST), and (SA) are switches that are closed by operating operation keys provided outside the camera, respectively. In addition, switches (S l), (S
2), (S M OL (S I S ), (S OR
) and (S A) are connected to the interrupt terminal (INT) of the microcomputer (BMC) through an AND circuit (AN), and therefore, when the data setting key provided outside the camera is operated. When the release button is operated,
Furthermore, from the back circuit (BCKC) to the signal line (BS
, ), and (BS2), and if the microcomputer (BMC) is in a stopped state, the microcomputer (BMC) accepts this interrupt signal and starts operating. The switch (SCN) is a switch linked to a mechanical film counter. This switch (SCN
) remains ON until the film counter reaches the position where the number of frames to be shot indicates "1", and remains OFF from the position of "1".
The signal from this switch (SCN) is connected to the input port (rP, ) of the microcontroller (BMC) and the terminal (T7).
) is input to the buck circuit (BCKC). The microcomputer (BMC) controls exposure using the shortest exposure time and maximum aperture value when the switch (SCN) is "ON". On the other hand, the switch (SCN) of the buck circuit (BCKC) is “O”.
During the period "N", data imprinting is not performed even if a pulse signal is input from the signal line (IP).
The link circuit (BCKC) outputs "1" for each pulse from the input signal line (IP) every time a photograph is taken from the set value.
There is a function to add or subtract ” and imprint this data, but when the switch (SCN) is “ON”, addition and subtraction operations are not performed. Note that when the switch (SCN) is “O”
By not outputting pulses to the signal line (IP) during N''', the buck circuit (BCKC) checks the state of the switch (SCN) and determines whether to perform data imprinting and whether to perform addition or subtraction. There is no need to judge whether or not to take a photo, and there is no need for a terminal (T,).In addition, an electric film counter is used instead of a mechanical film counter, and the film is placed at the correct frame position (the counter display is “1
”), connect the 'Low' signal to the terminal (T
, ), or furthermore, the pulse may not be output to the signal line (rp).

The switch (S A S ) is "ON""OFF" in conjunction with the metering mode switching member attached to the exterior of the camera.
”, and this signal is sent to the microcontroller (BMC).
I am inputting data into the input port (IP), and the microcomputer (B
MC) is output if a “Low” signal is input)
“Low” from (OP 7) to signal line (ASMO)
” signal is output to set the partial photometry mode, and the display unit (D S P ) displays the partial photometry mode. On the other hand, if a “High” signal is input to the input port (IP, ), If the signal line (ASMO) is “Hi”
gh” signal is output to set the average metering mode, and the display section (
Data indicating the average photometry mode is sent to DSP). The switch (S,) turns "ON" when the exposure control mechanism finishes its operation, and turns "OF" when the exposure control mechanism finishes its operation.
The signal from this switch (S, ) is input to the input port (IP, ) of the microcomputer (BMC).

The microcomputer (BMC) is connected to “Lo” from this switch (84).
If the “w” signal is input, release switch (S2)
Even if it is 'ON', it will not shift to exposure control operation. The back circuit (BCKC) shown in Figure 1 creates a time within the back circuit (BCKC) according to the film sensitivity read from the camera body (BD), and data is imprinted only during this time. Therefore, the pulse from the signal line (IP) is used only as a signal to start the imprinting operation.However, it also has the function of reading film sensitivity data from the camera body and creating a time corresponding to this data. The signal line (I
The back cover is equipped with a data imprint section that imprints data while pulses are being input from the camera body (P).
Microcontroller (BMC)
) is like this 1′j! It has the ability. The back circuit (BCKC) has a function to record the exposure time and aperture value for exposure control sent from the camera body. For this reason, the microcomputer (BMC) always sends the exposure time and aperture value to the back circuit (BCKC) before entering the exposure control flow and outputting pulses to the signal line (rp). Therefore, the back circuit (BCKC) is designed to control the exposure control from the camera body (BD) in order to reduce the probability that the rear curtain starts running and stops before data imprinting reaches the appropriate time. The imprinting operation is started when the time and print value are detected.

The operation of the camera system shown in FIG. 1 will be described below based on charts 70 in FIGS. 2 and 3. Switch (S1)
-(S z)(S MO)-(S I S )-(S
Either OR)-(S T ) or (S A ) is “O
N”, but the signal line of the back circuit (BCKC) (
When a “Low” signal is input from BS1) and BS2, the output of the AND circuit (AN) becomes “Low” and the interrupt terminal (INT) of the microcomputer (BMC,) goes LO.
II+''.Then, the microcontroller (BMC) that had stopped operating starts operating from step #1.First, in step #0, it outputs a "Low" pulse to the signal line (C8B). Then, the back circuit (BCKC
), and in step #1, the transistor (B
T) “ON” and the photometry circuit (FLM), (AMM)
, AD, DA conversion circuit (ADA), and lens circuit (LEC). Then, in step #2, either a 'Low' signal is input to the input port (IPI) and the switch (S2) is turned 'ON', or a release signal is sent from the signal line (BS2) of the back circuit (BCKC). It is determined whether or not the signal is being input. If the signal of "Low" is being input to the input port (IP), the process moves to step #3. In step #3, it is determined whether the switch (S4) is turned "OFF" and charging of the exposure control mechanism is completed. If the switch (S4) is not turned "OFF", the exposure control operation cannot be started, so step #10 is performed. to move to. On the other hand, the switch (S,) is
F”, then step #4 and set 7 lag R.
Determine whether LEF is '1''.This flag RLEF
is set to “1” if the data for exposure control (TVtAv) is ready and the release prohibition signal is not input from the back circuit (BCKC). It is reset to "0" when a release prohibition signal (input at the end of bracket shooting) is input from the link circuit (BCKC). If the 7 lag RLEF is "1" in step #4, the process moves to 70- of the exposure control operation starting from step #110, and the 7 lag RLE
If F is "0", the process moves to step #10.

In addition, in step #2, the input port) (IP,) is set to “Lo”.
If the signal w'' is not input, the process moves to step #10.

In step #10, 'Lo
-” is input, and if it is, set the 7 lags S and F to “1”; if not, leave S and F as “0” and #12 The process moves to the step .This may be due to the switch (S, ) inputting 'Low' to the input capacitor (IP.) or the back circuit (B).
CKC) is a preparatory operation for determining whether it is based on CKC).

Next, in step #12, the switch (SA S
), one of the partial and average light receiving elements in the photometric circuit (AMM) is selected, and the process moves to step #13. In step #13, the signal line (C3L) is set to "LO-", and by repeating the serial input/output operation multiple times, various data are read from the lens circuit (LE'C), and then in step #14, various data are read from the lens circuit (LE'C). , clock output terminal (C
KOUT) to open the clock output for A-Di conversion,
Output a "Low" pulse to the signal line (ADSTA) and output the photometric circuit (AMM) from A to D.

D-A! The A/D conversion operation is started by the converter circuit (ADA).

Next, in step #20, it is determined whether 7lag S+F was set to "1" in step #11,
If it is set, the process moves to step #21; if it is not set, the process moves to step #24. 7 lugs S +
F is set (1 and ν1 means that the switch (S
, ), back circuit (BCKC) signal line (BS, )
In this case, the signal line (AFEN) should be set to "Hi" to prevent the photographic lens from moving accidentally due to automatic focus adjustment.
gh” and set the 7 lags S and F to “θ” in step #25.
Then move to step #26 (in this case, it has already been reset to "MO"). On the other hand, #2
When 7 lags S and F are "1" at step 0, then #
At step 21, IPo is still 'Lo'.
Determine whether or not it remains as “w”. This is done using the back circuit (B
CKC) starts the external pressure operation of the 7 Lassie device 1 minute before interval photography, or the back circuit (
When the camera body (BCKC) starts the operation for exposure calculation, the signal line (BS
+) to output a "Low" pulse. By the way, when the camera body (BD) is activated by the back circuit (BCKC), the autofocus li! It is undesirable for the lens to move inadvertently due to adjustment, so when the back circuit (BCKC) starts up the camera body (BD), it starts the camera body (BD) at the moment when an interrupt signal is input to the microcontroller (BMC). A "Low" pulse with a width shorter than the time from step #21 to step #10 and longer than the time from step #10 is output to the signal line (BSI). Therefore, in step #21, enter Kapo-)(
At the time when the signal line (BS,) becomes Low" and it is determined whether or not to (AFEN) is set to "High" to disable the automatic focus adjustment operation, and proceed to step #26 via step #25. On the other hand, step #21
If it is determined that the input capacitor (IP.) is 'Low' in the step , this means that the photometering switch (Sl) is set to '○N', and in this case, the signal line ( AFEN) to “Low” to operate the automatic focus adjustment circuit (AFC) and set the signal line (C8AF) to “Low”.
After setting the autofocus lII adjustment data to “Low” and returning the signal line (C3AF) to “High,” #2
In step 5, reset 7 lags S and F to O'', and #
Proceed to step 26.

In step #26, data is read from the flash device (FL) and receiver (RFC). As mentioned above, this operation causes the signal line (C8F) to be set to “LO”.
Il''' and outputs a pulse of the first time width to the signal line (FMO). Then, when serial input/output operation is performed,
First, the first byte data is sent from the flash device (FL), then the meter (M
The second byte of the above data read from E T ),
Data is output in the order of the third and fourth bytes, and this data is read. Then, the signal line (C6F) is set to "I (high)" and the operation of step #26 is completed.

Next, in step #30, it is determined whether the film sensitivity setting switch (SIS) has changed from "OFF" to "ON", and if it is determined that it has changed, the film sensitivity data is increased by 173 Ev, and step #32 On the other hand, if it is not determined that a change has occurred, the process immediately moves to step #32, and the exposure compensation amount setting switch (
It is determined whether OR3) has changed from "OFF" to "ON". Then, if a change is detected, the exposure compensation amount is increased by 172 Ev in step #33, and the process moves to step #34. If no change is detected, leave as is #
Move to step 34.

In step #34, it is determined whether the switch (SCN) is "ON", and if it is "OFF", the process moves to step #40. On the other hand, the switch (SCN) is ON''
If so, the film counter is the regular number of frames (“1”)
(S...) In this case, the process moves to step #35. In step #35, the minimum exposure time (Tvmax) and the maximum aperture value (AvIIlax) corresponding to the minimum aperture are set for control,
After setting the 7-lag RLEF to '1'' in step #108, proceed to step #75.
Even if the control data from T ) is read from the receiver (RFC), the camera body ignores this data and
Exposure control will be performed using T vmax and A v+oax.

In this case, exposure calculation is not performed on the camera body (BD), and furthermore, desired settings for film sensitivity and exposure correction amount data are not accepted. In addition, the back circuit (BCK
Even if data prohibiting the exposure control operation is input from C), it will be ignored.

In step #40, it is determined whether the flag BCKF is 1". This flag BCKF is set in the back circuit (BCKC
) calculates exposure control data, sends this data to the camera body (BD), and causes the camera body (BD) to perform exposure control based on this data (hereinafter referred to as back ICP). '1 when is read
", and is reset to 0" otherwise. Therefore, since it is always reset to "O" during the first operation, the process moves to step 41. On the other hand, when exposure control is performed based on data from the back (BCKF=1), the step operation of changing data from $43 to #48 is not performed and the process immediately proceeds to step #51. Therefore, the switch (S M O), (S T
), (S A ) are operated, the data is not changed.

In step #41, the mode switch (S M O'I
It is determined whether the exposure control mode has been changed from "OFF" to "ON", and if it is determined that the change has been made, the exposure control mode is changed. On the other hand, the switch (SMO) remains “OFF” or “ON”’
Leave the tri output control mode as it is, #43
Move to the next step. In step #43, S, M
It is determined whether the mode is set, and since S and M modes accept changes in exposure time, the process moves to step #44. On the other hand, S.

If the mode is not M mode, the process immediately moves to step #46. In step #44, the switch (ST) is turned OFF.
It is determined whether the exposure time has changed from ``to ON'', and if a change is detected, the exposure time is increased by IEv. On the other hand, if no change in the switch (ST) is detected, #46 is immediately
Move to the next step.

As mentioned above, the shortest exposure time (174,000 se
After c), the switch (ST) changes from “OFF” to “ON”.
”, the maximum exposure time (32
sec), and in M mode, it changes to pulp6
In step #46, it is determined whether the mode is A or M,
Since the setting of the threshold value cannot be accepted unless the mode is A or M, the process directly proceeds to step #50, and if it is the mode A or M, a change in the switch (SA) is determined in step #47. If there is no change, the process moves directly to step #50, and when a change from "OFF" to "ON" is determined, the aperture value is increased by 172 Ev and the next step #50 is performed.
Move to the next step. In addition, $30. #32. $41
゜44. To detect the switch change from "OFF" to "ON" in 47, the state of the switch at that time is memorized at each step, and the state of the switch at the next step and the previous time are stored. It can be detected by comparing the state of the state with a stored signal.

In step #50, the signal line (CAD) is
Low", then serial input/output operation, and A-D
Read the converted data serially and connect it to the signal line (CS
A) is set to “High” and the clock output terminal (CKO
The output of the clock from V T ) is stopped and the process moves to step #51. Then, in step #51, it is determined whether the flag BCKF is "1" and if it is "1", #
#55 without taking steps for calculation of 52.53.54
Move to the next step. On the other hand, 7 lag BCKF is '''0
"If so, proceed to step #52 and determine whether a charge completion signal is input from the flash device (FL). If a charge completion signal is input, proceed to step #53.
In step 6, the exposure calculation for 7-lash photography is performed, and if the charging completion signal is not input, the exposure calculation for ambient light photography is performed.
BNC) moves to step #55. In addition,
A specific example of the calculation of #53.54 is given in Japanese Patent Application Laid-Open No. 59-11.
No. 1132, JP-A-59-140408, etc., so the description thereof will be omitted.

In step #55, the signal line (C3B) is set to Low.
", the signal line (BIO) remains "High" and the data is transferred to the back circuit (BCKC). The following data is sent from the camera body (BD). First, the 1st byte is the data sent from the flash device, and the 2nd, 3rd, and 4th bytes are the meter (MET) read from the register 7 (REC).
'). In addition, the back circuit (
When BCKC) determines that exposure control data from the meter (MET) has been input, it performs a display based on this data and sends this data back to the camera body (BD) as control data. This function is called an external function. This external function is a meter (
When exposure control data from MET) is input,
If the function 1 (hereinafter referred to as exposure function) in which the back circuit (BCKC) performs exposure calculations is active, what exposure modes (three types of P modes, S, A, M modes, and manual Yo full long time (M
/LT) mode) is not selected, it becomes an external function and performs exposure control based on data from the meter (MET). Further, when the exposure function 3 is in an active state, a function for storing a plurality of photometric values from the camera can be made active (hereinafter referred to as a multi-function function). The average value (Σ Bv
i/N) (average mode i=1 - mode), the intermediate value between the maximum and minimum stored photometric values (((
Bvmax+By+n1n)/2) (hereinafter referred to as center mode), mode to determine the value (Bvmax 2, 3) that reproduces the maximum value at the upper limit of film latitude (highlight mode), reproduces the minimum value at the lower limit of latitude There is a mode (shadow mode) for finding the value (Bvmin+2.7). Even if such a multifunction is active, the meter (M
If exposure control data is input from E T >, it becomes an external function and the multi-7T unit becomes invalid. Further, when the exposure function is in the active state, the 7T camera (bracketing function) for performing bracket photography can also be in the active state. At this time, the meter (
When it is determined that exposure control data from the meter (MET) has been input, bracket photography is performed based on the exposure control data from the meter (MET).

The 5th byte data sent from the camera body (BD) to the back circuit (BCKC) is the A-D-D-A conversion circuit (
Photometric data (By-Ayo) read from (ADA)
Avo: open aperture value), the 6th byte is the lens circuit (LE
The open aperture value data (Avo) read from C), and the seventh byte is the maximum aperture value data (Avmax). Furthermore, the 8th byte is the shortest exposure time data (Tvmax), the 9th byte is the maximum exposure time data (Twain), and the 10th byte is the synchronization limit exposure time data for flash photography (Tvx).
), the 11th byte is exposure time data (T v) determined by the camera body (BD), and the 12th byte is aperture value data (A v) determined by the camera body. Furthermore, when the 13th byte is the frame sensitivity (Sv) and the 14th byte is the exposure compensation amount (Cv), the microcontroller (BMC) of the camera body (BD) will 6
Move to step 2 and set the signal line (BIO) to “L”.
ow”. Then, 1 byte of data is sent from the back circuit (BCKC). This data is the aforementioned back ICP. The back circuit (BCKC) is exposed 77
For example, ``80H'' (H
indicates a hexadecimal number), and if no exposure function is selected, the back circuit (BCKC) does not output this data and the camera body (BD) outputs "OO".
H" is read. When the reading of this back ICP data is completed, the microcomputer (BMC) reads the signal line (C8B).
, (B I O) are set to "High" and the process moves to step #57.

In step #57, it is determined whether the back ICP is 80H'', and if it is not 80H, the back circuit (BCKC
) is attached, or the exposure function is not selected in the back circuit (BCKC). In this case, the calculation on the camera body or the data from the meter (MET) In order to perform calculations based on
is reset to ``0'' and moves to step #90.

If it is determined in step #57 that the back ICP is 180H'', this means that the exposure function has been selected, and the process moves to step #60.
Set Fugu BCKF to “1”. Then, the back circuit (B
Based on the data sent to the back circuit (BCK)
C) has enough time to calculate the exposure control data #6
Wait at step 1.

During this time, the back circuit first calculates a photometric value based on the sent data. During this time, the signal line (C6
B) sounds at the *mark of "Low". This means that if multi-7 anxian a is not selected, (B y −
A v +) + A vo = B, v is only calculated, but if the multi-77 chain is selected,
Calculations are performed according to the mode selected from among the average mode, center mode, highlight mode, and shadow mode described above. Furthermore, when in multifunction mode 1, no memory operation (pressing the memory key) is performed. As long as the photometry data from the camera body (BD) is updated, exposure calculations will be performed based on that data, but once a storage operation is performed, control data calculations will be performed based on the stored photometry data. The data from the camera body (BD) is only displayed.

Then, the photometric data obtained in this manner is subjected to exposure calculation according to the set exposure mode to calculate control data. In this calculation, the P1 mode is a program mode with a slope of 2/3, which divides By + 5v = Ev into the fringe value and exposure time at a ratio of 2:1 (in principle, Av = 2/3 ・EvS Tv = 1
/3 ・Ev), P2 mode has a slope of 1/2 (Av= 1 / 2 ・Ev).

Tv = 1/2 ・Ev), P3 mode has a slope of 2/
3 Progera A (Ay"1/3 ・Ev, Tv=2/3
・Ev) There are three types. In addition, in S mode, Ev - Tv = Av from Tv set by the buck circuit (BCKC).
A mode calculates Ev Av from the set Av
= Tv is calculated, and M mode is calculated based on the set Av, T
Calculate v as a control value. Note that the calculated Av is A
If y>Avmax, EV-Avmax=Tv, A
If v<Avo, E V A v o ” T v
Calculate this Tv and A vmax.

Alternatively, Tv and Avo are calculated values. Similarly, Tv<T
When vmin, Tva+in and EV-Tvmi
When n=Av and Tv>Tvmax, Tvn+ax and EV Tvmax=Av are calculated values. Also, P
IfP2. When in P mode, A VO < A Vl t A V2 < A vma
The aperture is limited by manually set AV, AV2, which is x.

Furthermore, in the M/LT mode, it is possible to set an exposure time longer than the maximum exposure time (Tvmin) that can be set on the camera body. When such a time is set, pulp data is sent to the camera body (BD), the power/vehicle body is set to pulp mode, and this time is set to the back circuit (BD).
BCKC).

During this time, the signal line (BS2) is set to "Low" to prevent the rear curtain from running, and when the count ends, the signal line (BS2) is set to "High" to allow the rear curtain to run. The display data is not the pulp display data, but the setting time display data is sent to the camera body.If the multi-77 function is not selected, the exposure control diagram and Ev value of each mode are sent to the camera body. A line is displayed graphically with the vertical axis representing the aperture value and the horizontal axis representing the exposure time.Also, if the multi-7 function is selected, each stored value and current value based on the exposure control value is graphically displayed. Ru.

Also, if the bracket function is selected,
Using the calculated control value as a reference, a control value is calculated by shifting the set deviation amount by the number of 7 frames at that time. Note that the graphic display at this time displays the current shooting position in the form of a bar graph. Details of the display on the Kiride 77 screen will be described later.

Additionally, if it is determined that there is a charging completion signal in the data from the flash device input via the camera body, the back circuit does not perform the above-mentioned calculation display and the camera body (B Display Tv and Av from D) and use the data as control data. This is the calculation for 7-lash shooting on the camera body side (step #53)
However, for example, JP-A-59-140408, JP-A-59-
As shown in No. 111132, etc., the back circuit (BCK
This is because there is no need to perform calculations for flash photography on the C) side.

For example, in order to support a camera body that does not have a flash photography function as mentioned above, the same calculation as step #53 is performed on the back circuit side, and when the charging completion signal is input, the exposure is If the function is selected, the flash 77 may be automatically selected, calculations may be performed according to the exposure mode set at that time, and control data may be sent to the camera body. Furthermore, calculations that combine the multi-7T function, the bracket function, and the 7-lash function may be prepared, and the results of these calculations may be sent to the camera body (BD).

After enough time has passed for the above calculations to complete, the microcomputer (BMC) returns #62(7)X? Shifting to the final stage, the signal line (BIO) is set to "Low", serial input/output operation is performed, and data is read from the buck circuit (BCKC). In this data, the first byte is exposure time data for control (pulp when in M/LT mode), the second byte is fringe value data for control and display, and the third byte is exposure time data for display (M/LT mode). mode (setting exposure time), 4-byte back exposure mode (P,, P,
, P3 is P mode, M, M/LT mode is M mode, external function is meter photometry mode), 1.2 bytes of control data is data limited to the limit value because Ev is out of control interlock. There is non-linked data indicating that the exposure control operation is prohibited, data (release prohibition data) indicating whether the exposure control operation is prohibited, etc. After reading these 4 bytes of data, the microcontroller connects the signal lines (C8B) and (B I O) to “
High” and read the T at step 63.
v, A v is set as control data. Then, it is determined whether or not the release prohibition data has been read, and if it has been read, the flag RLEF is set to "1".
If it has not been read, the 7-lag RLEF is reset to "0" and the process moves to step #70.

In step #70, the exposure mode is displayed according to the read mode data (M mode when in meter metering mode), and in step #71, it is determined whether non-linked data is being read, and the reading is performed. If it has been read, a warning is displayed, and if it has not been read, the warning is not displayed and the process moves to step #74. #7
In step 4, select meter metering mode or camera body (B
D) displays whether the mode is average metering mode or partial metering mode.

In step #75, the control exposure time and aperture value are displayed. Note that when long exposure time data is sent from the back circuit (BCKC), bulb data is sent for control purposes, but this long time data is sent for display purposes. This data will be displayed.

Next, in step #76, the film sensitivity and exposure compensation amount are displayed, and then, based on the data sent from the flash device (FL), whether or not flash photography will be used is displayed. Next, in step #78, the signal line (C
SF) is set to "L oul" and a pulse during the second time is output to the signal line (FMO).

When the 7 lash device (FL) reads this pulse, it becomes ready to read data. Then, the microcomputer (BMC) first bytes the control numerical value and exposure control mode, the second byte is data (Sv + Cv) that adds the film sensitivity and exposure compensation amount, and the third byte is the focus of the interchangeable lens. This is distance data (fv).

The utility of these data is as described above.

When the above operations are completed, the switches (S, ), (S2), (SMo), and (SIS) are next moved in step #79.

It is determined whether at least one of (S OR), (S T ), and (S A ) is closed. and 1
If it is closed at any time, the timer is reset and started, returns to step #2, and repeats the operation described above. On the other hand, if all of the above switches are "OFF", it is determined in step #84 whether the IJI (10 seconds) has ended when the timer started counting in step #8o. And if it hasn't finished, go back to #2
Go back to step.

Meanwhile, all the above switches are 'OFF' and 10
When sec has elapsed, the process moves to step #85. Then, in step #85, the microcontroller enables interrupts to the interrupt terminal (INT), resets the 7-lag RLEF and BCKF to "0", turns the display OFF, and turns the power supply transistor (BT) OFF. (BMC) stops operating.

When it is determined that the back ICP is not "808" in step #57, 7 lag BC is determined in step #58.
Reset KF to 0" and move to step #90 in Figure 3. With the #90 steering knob, the meter (ME
The receiver (RFC) reads exposure control data from T) and determines whether the camera body (BD) has read this data. And when I read it #91
If no reading has been performed, the process moves to step #100. In step #91, the data read from the meter (MET) is limited to the maximum aperture value and the maximum aperture value, and the exposure time is limited to the shortest and longest values for constant light photography. For flash photography, limit the exposure time to the sync limit and longest exposure range. Then, the data from the meter (MET) thus determined is set as a control value, and the exposure control mode is set to M mode and the photometry mode is set to meter photometry mode, and the process moves to step #105. On the other hand, at step #90, the meter (MET
) is not read, the data calculated in step #53 or #54 is set as control data in step #100. In addition, #63゜92
．． Setting the control aperture value at 100 is based on the number of aperture stages (A
v-Avo).

In step 101, the exposure control mode of the camera body (BD) is displayed, and the metering mode is displayed, and step #105 is displayed.
Move to the next step. When the control data is limited to the interlocking limit data, the warning display is set to "○N", and when it is not limited, the warning display is set to OFF.
The lag RLEF is set to 1'' and the process moves to step #75 in FIG.

In step #2, the input capo) (IP, ) is “Low”, the switch (S,) is “○FF”, and the 7-lag RLEF is “
1", the exposure control operation starts from step #110 in Figure 3. First, in step #110, the signal line (
AFE) is set to "High" to stop the operation of the automatic focus adjustment circuit (AFC), and then a release signal is transmitted to the 7/2 shutter device (FL). This operation closes the signal line (C3F) to “Lou+” and closes the signal line (FMO
) outputs a pulse during the third time on the signal line (C8
Set F) to High again.Flash device (FL)
When it is determined that a pulse of this third time width has been input, the light emission mode for photographing is entered. Next, the signal line (C6
B) is set as "Lou+" and the control exposure time data and aperture value data are sent to the back cycle II (BCKC). This data is used as data for imprinting in the back circuit (BCKC), and when this data is input, the back circuit starts a data imprinting operation if the imprinting function is selected. The imprinting functions include control data mode, year/month/day mode, month/day/year mode, day/month/hour mode, month/date/hour-mode, day/hour/minute/mode, and hour.・There are minutes/seconds mode, count/up mode, count/grand mode, and fixed data mode.

In the control data mode, the control data calculated by the back circuit (BCKC) (only when the N output function is selected) or the control data sent from the camera body (BD) in step #112 is imprinted. The year/n/day mode, month/day/year mode, day/month/year mode, month/date/hour mode, day/hour/minute mode 1, and hour/minute/second mode are based on the buck circuit (BCKC). In the count-up mode and count-grand mode, in which mode name data from the calendar circuit is imprinted in the order of the mode name, a value obtained by adding or subtracting "1" from a preset fixed value each time is imprinted. Fixed data mode imprints preset values.

Next, in step #113, the microcomputer (BMC) closes the signal lines (C3A) and (ADMO) to 'Low' and sends the summed data (Sv+Cv) of film sensitivity and exposure compensation amount to the A-D-D-A conversion circuit. Send to (ADA).Circuit (A
DA) reads this data Sv+Cv, performs D-A conversion, and sends it to the flash light amount control circuit (FLM).
). Next, set the film sensitivity on the timer to control the imprinting time, and in step #115 set the signal line (IP) to "Low" and set the back circuit (BC) to "Low".
KC) is capable of determining the start of data imprinting, and starts the imprinting operation of a data imprinting device that does not have an imprinting time control function. Then, interrupts by the timer are enabled and the timer starts counting. Then, in step #120, a count interrupt is enabled, a "Low" pulse is output to the signal line (RL), the release magnet is operated, and the narrowing down operation and mirror up operation are started. 7. Then, in step #122, sufficient time is waited for the mirror up operation to be completed. During this time, the aperture pulse output circuit (APG
) is input to the clock input terminal, and the embedded stage number data preset in the down counter is input. is subtracted every time a pulse is input. 7, and when the contents of the counter reach 0'', a counter interrupt occurs and #1
Perform 50 steps. In this step, a "LoIM" pulse is output to the signal line (AP) to operate the aperture magnet and stop the aperture operation. Then, the timer interrupt is enabled and the process returns to the main routine. Also, if an interchangeable lens that cannot control aperture is attached or no interchangeable lens is attached, the counter interrupt may not occur, so if a certain period of time has elapsed in step #122, step #123 will occur. Move to
The counter interrupt is disabled and the process moves to step #125.

In step #125, it is determined whether the control exposure time data indicates a valve. And if it is not a valve #12
Move to step 6.

In step #126, “Lou” is connected to the signal line (IC).
+'' pulse is output to operate the front curtain magnet and start the front curtain running.Next, the exposure time is counted, and when the count is finished, the signal line (2C) is set to Low.
'' pulse is output, the trailing curtain magnet is operated to start running the trailing curtain, and the process moves to step #135. #1
If it is determined in step #25 that it is a valve, the process moves to step #130, and the leading curtain is run.

Then, the input signal to the input capo) (IP,) is 'High'.
Wait until it becomes h”. At this time, the back circuit (BCKC
) is not attached, wait until the release button is released and the switch (S2) turns "OFF", and when the switch (S2) turns "OFF", the trailing curtain starts running. On the other hand, the back circuit (BCKC) is installed and the M/LT
is selected, the signal line (IP) is “L”.
The buck circuit (BCKC) starts counting time from the moment it becomes “ow”, and the signal line (BS2) is set to “L”.
Then, when the back circuit (BCKC) finishes counting, the signal line (B S 2) is set to “ow”.
High", the camera body (BD) uses this signal to start running the rear curtain. In this way, in M/LT mode, the camera body (BD)
Exposure time counting starts with a signal input via the signal line (IP) from Since the exposure time is long, the error does not have a large effect on the exposure.

Normally, the timer corresponding to the film sensitivity has finished counting up to step #135, and when the timer has finished counting, a timer interrupt occurs and the step #14
In step 5, the signal line (IP) is set to High'' to stop the imprinting operation, enable counter interrupt, and return to the main routine.

In step #135, when the exposure time is short, the signal line (IP) remains "Low" even when the trailing curtain starts running.
There are times when Therefore, in order to forcibly stop the imprinting operation (to prevent imprinting from occurring during winding), the signal line (IP) is set to "High". Also, in step #136, the back circuit (BCK
In order to stop the imprinting operation caused by C), a "LOW" pulse is sent to the signal line (CSB) for a certain period of time, and the back circuit (BCKC) starts imprinting when this pulse is input from the signal line (C8B). Abort the operation. Then, the counter and timer interrupts are not accepted,
Wait until the trailing curtain completes running and the switch (S, ) turns "ON". Then, when the switch (S4) is turned "ON", the 7-lag RLEF and BCKF are set to '0', and #
Return to step 2 and perform the operations described above.

When a continuous shooting mode such as interval function or bracket function is selected in the back circuit (BCKC), “
The "Low" signal remains input, and the above-mentioned exposure control preparation operation is performed even during the winding operation, and as soon as the winding is completed and the switch (S4) is turned "OFF", the next exposure control starts. Such continuous shooting is also performed when the release switch (S2) remains "ON".

When the camera body (BD) is activated by a signal from the signal line (BS, ) of the back circuit (BCKC), automatic focus adjustment is not performed, but the voltage boost of the flash device (FL) is The width of the starting pulse is distinguished between activation for starting the back circuit (BCKC) and activation when a key is operated on the back circuit (BCKC).
When the key operation in C) is performed, an automatic focus adjustment operation may be performed.

Furthermore, there are other devices that are not activated when activated by the back circuit (BCKC) but activated when activated by the photometry switch (Sl), such as a buzzer that warns of camera shake. In addition, in order for the microcomputer (BMC) to determine what the start signal is, a back circuit
The signal from C) is a pulse with a width of less than a certain time, but if you input it to a different input port from the switch (S,), you can take measures such as limiting the pulse iJ. becomes unnecessary.

Note that the back circuit (BCKC) allows exposure time control longer than the maximum exposure time of the camera body only in M/LT mode and outside, but if the exposure function is selected, it can be used in any mode. However, long-term exposure time control may be possible, and furthermore, it may be possible when an external function is selected.

Also, during interval shooting, a start signal is sent to the camera body (BD) one minute before the shooting operation of one group is started, and the camera body (BD) exchanges data with the 7 rough shooting device (FL). , the pressure increase of the flash unit (PL) is started. By the way, since the flash device continues to increase the pressure for 15 minutes after starting the pressure increase operation,
Very often, boosting is continued even after imaging of one group is completed. If the interval between groups is very long, boosting the voltage after one group has been photographed is wasted, resulting in wasted battery power. Therefore, when the shooting of one group is completed, the back circuit (BCKC) sends data indicating that shooting of one group has ended to the camera body (BD) (for example, the lowest bit of the back ICP is set to "1"). When this data is input, the camera body (BD) sends a boost prohibition signal to the 7 flash device (FL) (the current bit or 4th byte of the 3 bytes of data sent to the flash device (FL) prepare)
The flash device (FL) may stop its boosting operation when this data is input.

Next, the relationship between the function and display of the back circuit (BCKC) and a specific example of the back circuit (BCKC) will be explained.

FIG. 4 shows an external view of the bag (BCK). (1) is the battery lid of the battery compartment, and (2) is the external display section, which indicates that the operation is stopped. (3) shows a key cover for protecting some keys of the operation key, (4) shows a grip part, and (5) shows a part of the operation key.

FIG. 5 shows a state in which the external display section in FIG. 4 is in an operating state and the key cover is open. Explain the function of each key. (6)
Use the function keys to select each function. (7) Select the mode within each 77 links using the mode key. (8) is an operation key for switching between execution and non-execution of each function. In (9), use the Enter key to change the external display sequentially (. In (10), use the Adjust key to change the external display from the control state to the numerical value setting state, and from the numerical value setting state to the control state. (11)
(12) is the up key, and (12) is the grand key to change the numerical value in each mode and shift the program line. (
13) uses the cursor keys to sequentially send each digit to be changed when changing numerical values in each mode.

(14) is a memory key that imports photometric data from the camera. (15) is the memory clear key that clears all the photometric data that was imported using the memory key.

Figure 6 shows the operating state on the external display, and the EXPO
The P and mode of the 8URE7 function are displayed. Each display section will be explained. (16) is a character display section using a 10-digit 5.times.7 dot liquid crystal display, which displays shutter speed values, aperture values, mode names, operating procedure messages, etc. (17) indicates the display position of the shutter speed value <T> and the aperture value <F>. (18) displays the screen code selected in the EXPO8URE7y function. (19) shows each function name, and each time you press a function, EXPO8URE-
4 (MULT I-M)-.

(BRACKET)→IMPRINT→INTERVA
L-B&W-, EXPO8URE→... and so on. MULT I-M7 angle and BRAC
The KET7 function is skipped and cannot be selected when the EXPO8URE7γ function is not executed.

Also, EXTERNAL7 anxion is EXPO3UR
Camera body (BD) when E7y function is in execution state
This can only be executed when control data from the meter (MET) is input, and cannot be selected using the function keys. (20) is a symbol indicating the selected function on the external display (indicates the displayed function. (21) is a symbol indicating that each function is in the execution state. (22) is the shutter It is an index that shows the speed value, and (23) is an index that shows the aperture value.If the shutter speed value is 2 seconds or less and the aperture value is F32 or more, it is displayed with a "" symbol. (24) is a graphic display In the section, (25) indicates the photometric line, which is hereinafter referred to as the EV line because it indicates an equal EV value.(26) indicates the program line, which is a high-speed program and indicates the P mode with a slope of 2/3.There is a limit depending on the lens. On the aperture side, it is Fl, 4, and on the aperture side, it is F22, and arbitrary aperture limitation is performed by opening F2, F8, and Fil.The lowercase numbers on the character display section are in units of 1/4 EV. , and a control point <1/60, F4+1/4EV>, which is the intersection of the program line and the EV line, is displayed.

FIG. 7 shows the P2 mode in which the slope of the program line is 171, and FIG. 8 shows the P mode in which the slope of the program line is 172.

As can be seen from this figure, in the P mode, the dots on the graphic display are displayed in a straight line with the F value side set at IEV pitch or the exposure time side set at IEV pitch. Table 1 shows the transitions between each function and each mode.

The double-framed modes are the initial settings when the device is reset, such as when replacing batteries. The operating procedure for each mode in each function will be explained.

FIG. 9 shows the P2 mode of the EXPO3URE7γ function. Move the ''' mark to (6) on the FUNC key to select the EXPO8URE7y link, then press the MODE key (7) to select the recharacter display area (
16) Display the mode name "PROGRAM2" and set it to P2 mode. The mode display section (18) of EXPO3URE7 Anximin has “Ma” above “P”.
The mark is lit. In the graphic display (24), the camera shutter speed control limit 1740
00 seconds and 30 seconds and lens control limits F1.4 and F2
2, the program line is restricted. In addition, the slope part of the program line is 17250 seconds and F in the initial setting state.
It passes through point 5.6. Next, the OPE key (8)
When is pressed, the EXPO6URE7 function is put into execution, and the "mark (21)" lights up as shown in FIG. 10, and the EV line (25) appears.

Next, press the ENT key (9) to display the mode name (“PR”).
OGRAM2'') to the control display (hereinafter referred to as 0UTPUT display).The shutter speed value at the intersection of the program line and EV line is 1760 seconds and F2.8.
is displayed on some characters (Figure 11), 0UTP
In the UT display, the slope of the program line can be shifted using the UP key (11) and DOWN key (12).

FIG. 12 shows a state in which the UP key (11) has been moved to the right. Next, when the ADJ key (10) is pressed, the display switches to the setting display (hereinafter referred to as the INPUT display) and first asks for the FMAX value. In FIG. 13, the FMAX value shows F22 due to initial setting. When the FMAX value is lowered to F8 using the DOWN key (12), the slope of the program line stops at F8 and a restriction is added, as shown in FIG. After setting the FMAX value, press the ENT key (9) to proceed to FMIN. 15th
In the figure, Fl, 4 is displayed because the character display section switches to FMIN value setting for 6 initial setting. u
Change the FMIN value using the p key (11). 16th
The figure shows a state where F2.8 is set. Then E
Press the NT key (9) to complete the setting C0MPLE1'
"ED" display is displayed on a part of the character. When the completion display appears, when the ADJ key is pressed again to switch to the 0UTPUT display, the camera control value is displayed on the character display section (FIG. 18).

To the dog, E
s 7 (7) S mode (shutter speed priority mode) will be explained.

Press the MODE key (7) to display S on the character display.
MODE" display and select S mode, the 19th
It will be displayed as shown in the figure. Here, the OPE key (8) is used to enter the execution state.

(Fil, 4, and F22 are limited by the lens.) When you switch to 0UTPUT display with the ENT key (9), an underline (cursor) appears in the shutter speed value display section of the character display section (16). is displayed (Figure 20). Underline is UP key (11)
Alternatively, it indicates that the numerical value can be changed by pressing the DOWN key (12). 17125 by UP key (11)
If the time is changed from seconds to 11500 seconds, the result will be as shown in Figure 21.

At the same time, the aperture value also changes to the appropriate exposure value.

Next, the A mode (aperture priority mode) of the EXPO3URE7y function will be explained. Press the MODE key (7) to display "A MODE" on the character display and select A mode, and the display will appear as shown in Figure 22.Press the OPE key (8) to enter the execution state. Also, depending on the camera, the tail is limited to 30 seconds (display section) and 1/4000 seconds. E
NT key (9) 1.1m, l: '] When switched to 0UTPUT display, an underline is displayed in the print position display section of the character display section (16), indicating that the numerical value can be changed. (Figure 23).

[JP key (11) i:Yo') F5,6 Kara F1
When changed to 1 + 2/4EV, it becomes as shown in Figure 24.

At the same time, the shutter speed value also changes to the appropriate exposure value.Next, the M mode (manual mode) of the EXPO6URE77Nxian will be explained. MODE key (
7), “MMO” is displayed on the character display section (16).
DE" display and select M mode, the display will appear as shown in Fig. 25. The OPE key (8) will enter the Q execution state. Also, the shutter speed and aperture can be adjusted by pressing the OPE key (8). If you use the ENT key (9) to switch to the 0UTPUT display, it will appear as shown in Figure 26.At this time, an underline will appear on the shutter speed value display, indicating that the value can be changed. (Fig. 26).Use the up key (11) to change from 1/250 seconds to 171000 seconds, and the result will be as shown in Fig. 27.Next, use the cursor key (13) to display the underline (cursor) at the aperture position. Figure 28), DOW
F5.6 to F2,8+Z/4E with N key (12)
When changed to V, it becomes as shown in Fig. 29.

When the cursor key (13) is operated again, the underline moves to the shutter speed value display section, and the shutter speed can be changed.

Next, the long time mode of EXPO8URE7 Anxian will be explained. By pressing the MODE key (7), "M MODE/L, T" is displayed on the character display section and when the long time mode is selected, the display is displayed as shown in Fig. fIfJ30. It is in the execution state by pressing the OPE key (8). When the display is switched to 0UTPUT using the ENT key (9), the display will become as shown in FIG. 31. The underline is on the aperture display section, indicating that the fuzz value can be changed, but the cursor keys (13) are disabled and the shutter speed value (long time) cannot be changed at 0UTPtJ.
T: I can't do it with &. Next, when the ADJ key (10) is used to change to the INPUT display, the shutter speed value can be set as shown in FIG. The shutter speed value (long time) can be set from 10 seconds to
9990 seconds, which can be set in 10 second increments.

The underline is initially set at the tenth digit,
Sequentially, the hundreds digit, the tens digit, the first digit, and then back to the tens digit, and then press the UP key (11) or the DOWN key (1), respectively.
2) to change the numerical values (Figures 33 and 34). When the setting of the shutter speed value (long time) is completed, switch to the 0UTPUT display again by pressing the ADJ key (10).

Camera control values are displayed on the character display section (FIG. 35).

Next, the AVERGE mode in which the average calculation of the MULTI/M (multimetering) function is performed will be explained. This M (JLT I-M77 union is EX
FUNC when PO3URE7 function is in execution state
This can be set using the key (6). EXPO8URE
7r In the ``C'' state, press the FUNC key (
6) Select the JLT I-M77 link, then press the MODE key (7) to display the mode name "AVERGE" on the character display (16) and set the AVERGE mode. (Fig. 36).Here, the mode of EXPO3URE77Nxian is set to P mode from the mode display.The OPE key (8) puts it into the execution state, and the M key (14) allows you to import the photometric value. The controllable range is shown at the top of the graphic display from -6 (EV) to 6.
(EV) is displayed on the LCD. In addition, the graphic display section has an index display ("') indicating the width of deviation during highlight calculation and shadow calculation, and an index display ("-KakuKakuichi") indicating out of linkage on the left and right. One point display (“
Cabinet? ') is the first photometric point and is usually located in the middle (0 position). 0UT by ENT key (9)
When the PUT display is selected, the E
P mode (for example, P2) of XPO8URE77
The shutter speed value and aperture value set in W mode) are displayed on the character display section (16) (3rd mode).
Figure 7). At this time, the "A" of "AVERGE" is displayed in the middle to indicate the AVERAGE mode.

Next, when you operate the M key, the first index one level above the above index will be displayed.
The value of the photometric point is fetched, and the one point display ("■") moves one step below the index display. At the same time, a second photometric point appears one step above the index display with reference to the W&1 photometric point (
(Fig. 38), at this time, the value of the first photometric point taken in is in an AE-locked state, and the character display section (16) shows the mode selected in EXPO3URE7 (in this case P2 mode). Displays the shutter speed value and aperture value calculated by

If you operate the M key (14) again, the second photometry point will be imported, and the first and second photometry points will be balanced with respect to the 0 position! ! The character display unit calculates the average of the first and second photometric point values, calculates the shutter speed value in P2 mode, and displays the fringe value (Fig. 39). ). At this time also the third
A photometric point appears one step above the index display. By sequentially operating the M key (14), you can import and display photometric values up to 8 points.
From the 9th point onwards, the 1st point is replaced (1), and the latest 8 photometric points can be imported and calculated. Figure 40 shows the state in which the 3 photometric points have been imported. Figure 41 shows the state in which the highest eight photometric points have been captured.Here, MOD
When you operate the E key (7), the character display section (16
) changes from 0UTPUT display to mode name display, and “C
CENTER mode is a mode that calculates the average of the MAX value and MIN value of the photometric value, and the photometric value taken in one step below the index display based on the zero position is displayed on the graphic display section. Move the point force C1 indicating the MAX value and MIN value of the point to the balanced position (Figure 42).Next 1 ENT key (9)
As a result, 0UTPUT is displayed, and the character display section (16) displays the calculated shutter speed value and aperture value, and C'' of CENTER mode is displayed between them (the fourth
Figure 3). Press the MODE key (7) again to HI GHL.
I Change to GHT mode and H appears on the character display.
The mode name display of ``IGHL IGHT'' is displayed.At the same time, the point display that reduces the MAX value of the captured photometric point moves to the position of +2.3Ev, and the point display that shows the MAX value is set as the reference. The entire photometric point display captured in is moved (Fig. 44).

At this time, the metering points that extend beyond minus 6Ev will be displayed in the same number as the minus 6Ev position.0 UTPUT will be displayed by pressing the ENT key (9), and the shutter speed value and aperture value calculated based on the highlight standard will be displayed. Then, 'H' for HIGHL IGHT mode is displayed on the character display (@Figure 45).Press the MODE key (
7) changes to the 5HADOW mode, and the mode name "5HADOW" is displayed on the character display section. At the same time, the point display showing the MIN value of the photometric point captured moves to the -2.7Ev position, and the entire captured photometry point display moves based on the point display showing that MIN value ($ Figure 46)
. At this time, the photometric points that protrude beyond +6 Ev are displayed at the position of +6 Ev by that number. Next, ENT
The key (9) will display 0UTPUT, and the shutter speed value and fringe value calculated based on the shadow standard will be displayed.
During this time, 5HADOW mode "S" is displayed on the character display (Fig. 47).The MODE key (
If you operate 7), you will return to AVERAGE mode again.
Repeat sequentially. There is one more mode in addition to the mode described above in the MULT I.M7 Anxine.

When the EXPO8URE77 link is in M (manual) mode, the MULTI-M7 link.

mode becomes MANUAL mode and other gears do not appear.
The DE key (7) becomes invalid. In the MANUAL mode, the control value is the set value of the EXPO3URE7 function in the M mode, and the 0 position of the index display is the set value. Therefore, as shown in FIG. 49, the photometric value from the camera exists at a position that is shifted by the amount of shift from the set value. E
0UTPUT is displayed by pressing the NT key (9), and the shutter speed value and aperture value, which are the set values, are displayed on the character display section (16), and "M" is displayed on the character display section (16) (Fig. 50). ), the OPE key enters the execution state, and the M key imports the photometric points in the same way as in the other modes. It is in a state where it has been imported. In these cases, the character display section (16) remains unchanged at the set value. As shown in FIG. 53, the photometric distribution for a certain subject can be determined at a glance using a graphic display. Here, press the UP key (11) or DO
By pressing the WN key (12), it is possible to move the entire photometric distribution map made up of the captured photometric points to the left or right. In FIG. 54, since there is an underline in the shutter speed value display area, the shutter speed value is changed at the same time as the photometric distribution map is moved by pressing the UP key (11). Therefore, this function makes it possible to perform exposure control according to the luminance distribution of the subject, and furthermore, it is possible to arbitrarily change the width of highlight and shadow exposures, which are fixed at 2.3Evv2.7Ev. If you use the cursor keys to move the underline to the aperture value,
If the aperture value has been changed, and in the above explanation, select the most appropriate point on the photometric distribution map by pressing the UP key (1).
1) Alternatively, by arbitrarily changing the shutter speed value or aperture value using the DOWN key (12), it is possible to move the index display to the 0 position and set an appropriate value for the subject according to one's own judgment. In other words, this MU
In commonly known terms, the MANUAL mode of the LTI-M77 can be said to be a type of metered manual.

Next, BRACKET 7 Angkun Kong will be explained. This function performs photography by shifting the exposure value based on the captured photometric data. It is possible to shoot with a shift of up to 97 frames, and the start value, shift width, and number of frames can be set. This 7th anxillion is also skipped and cannot be selected if the EXPO8URE7 anxion is not in the execution state.

Figure 55 shows the state of mode name display,
The E7y indicator indicates that the P mode ht is selected, and an index indicating the shift start value and shift amount is displayed at the top of the graphic display section (24). This index is common to that indicating the photometric range of the MULT I-M7 Anxicon, but it is also possible to provide a different index. An index indicating the shift range is displayed on the graphic display section. Also, BRACKE
T7 Ankushin is in a non-execution state and tails. In the ENT key (9), iQ, 56th rXI+, ::0U as shown.
The display changes to TPUT. Character display section (16)
The amount of deviation from the reference value and the remaining number of 7 frames are displayed. In addition, the OPE key (8) has entered the execution state, and therefore, a new BRACKET7 is displayed under the indicator in the same shift range on the graph ink display section (24).
A display will appear indicating the operating status of the angkung yong. Next A
DJ key (10)! =, kQOUTPUT display')I
When the display is changed to the NPUT display, as shown in FIG. 57, the message "FROM" appears on the character display W (16) to set the start value of the shift.

Here, press the UP key (
11) Alternatively, when the value is changed to a desired value using the DOWN key (12), the index and the operation display move as shown in FIG. 58 together with the key input. Large ENT key (9)
As a result, the message "5TEP" for setting the shift width appears on the character display section (16) (!#59 figure)
. The shifting width is 1/4Ev.

You can select from 4 types: 1/2 EV, I Ev, 2 EV, and press the UP key (11) or DOWN key (12).
Change the underlined values and set them (Figure Pl!J60). By pressing the ENT key (12) on the dog, 7.NOCENO ``FRAME'' appears on the character display section to set the number of 7 frames to be photographed as shown in FIG. UP key (11) or 1 is DOWN key (1
2) When you change and set the underlined value (97 frames this time), the width of the index and the operation display will be continuous from the start value of the shift to the final value of the shift in the graphic display section. to display the shift range (Fig. 62), press the ENT key (12) on the dog.
Therefore, 00MPLE is displayed in the character display section (16).
The message ``TED'' will be displayed to notify you that the settings are complete.

At this point, if you operate the ENT key (12), the “FR” button will appear again.
Return to OM" and repeat each setting display. ADJ key (10)
As a result, the INPUT display changes to the 0UTPUT display, and the character display section (16) shows the amount of deviation from the reference value and the remaining 7.

display the number of times (Figure 64). Next, when you release the camera, the light metering value at that time will be locked, and the exposure value of each 7 frames will be shifted based on that metering value. Pl.

P2. The camera is controlled by converting the shutter speed value and aperture value set in P3 mode). FIG. 65 shows a state in which the camera has been released once, and the character display section (16) displays the amount of deviation of the exposure value controlled by the next release from the reference value and the number of remaining 7 frames. Then, the graphic display section (24
) changes in the operation display to display the range from the next control (exposure) value to the final (M output) value.

FIG. 66 shows a state in which the camera has been released twice, and FIG. 67 shows a state in which the camera has been released eight times. The remaining number of 7 frames on the character display section (16) is “
1" to show that there are 17 frames remaining, and the graphic display section (24) only displays the final value.

When the camera is released to photograph the last 7 frames set for the dog, the character display section (16) and the graphic display section (24) are reset to the set values and displayed again as shown in Figure 68. The state changes to a state in which new photometric values can be taken in, the display state becomes the same as that shown in FIG. 64, and camera control can be performed repeatedly. BRACKET7 function is in execution state and external i is indicated 11s(2)(7)! Exhibition EXPO
If you change to 3IJRE7y function, BRACK
When the ET7 function is executed, the EXPO8URE7 function is set to P on the graphic display section.

When S or A mode is selected, the Ev line moves parallel to the program line, and when M mode is selected, the threshold value line moves parallel to the program line. Therefore, it can be easily confirmed that BRACKET7 ankshishin is executed.

Next, the imprint 77 xyan will be explained.

When the imprinting function is selected by operating the FUNC key (6), the mode becomes an exposure control data imprinting mode, and when the PE key (8) is operated, the mode becomes operational. If the exposure function is selected at this time, the line diagram and Ev line at that time will be displayed (plS69
figure). When the ENT key (9) is pressed, the control value (camera control value) calculated by the back circuit (BCKC) at that time is displayed (FIG. 70) and this data is imprinted.

On the other hand, if no exposure function is selected, E
When the NT key (9) is pressed, data sent from the camera body (BD) is displayed as data to be imprinted.

In this case, no graphic display is performed.

Press the MODE key (7) to enter year/month/day mode.
The mode name is displayed on the character display section (16) (
Figure 71). Next, press the ENT key (9) and the data from the currency microcomputer (CAMC) will be displayed (7th
Figure 2). If a photograph is taken in this state, the data of this character display section (16) will be imprinted. Also, if you press the ADJ key (10) in the state shown in Figure 72, you can change the data, and a cursor will be displayed in the year data display area (
Figure 73).

Then, when you press the cursor key (13) twice, the cursor is displayed below the day data display section, and the UP key (13) in Figure 73 is displayed.
1) is pressed three times to change the day data from the 12th to the 13th. If the ADJ key (10) is pressed in this state, the display state shown in FIG. 75 will be created and this data will be imprinted. Incidentally, imprinting is performed even in the display state shown in FIGS. 73 and 74. Also, if the currling data is changed (
The display data (data from the currency microcomputer (CAMC)) is also changed. Each time the MODE key (7) is pressed in this state, the imprint mode is changed in the order shown in Table 1, and the mode for hours, minutes, and seconds is changed, and then the
When the ODE key (7) is pressed, the up-count mode is entered. FIG. 76 shows the mode name display state of this up count mode. If the ENT key (9) is pressed in this state, the display state shown in FIG. 77 will be obtained. and ADJ key (10)
When you press , a cursor appears and the data corresponding to the cursor position is displayed using the up key (11) and down key (12).
It is possible to change it with . Amp key (11)
Then, it changes in the order of 0 → 1 → ... → 9 → - → blank → 0, old, etc., and in the reverse order with the down key (12). FIG. 79 shows a state in which the data change has been completed in this manner. If the ENT key (9) is pressed in this state, the cursor will move as shown in FIG. When photographing is carried out in this state, the data incremented by "1" is sequentially imprinted.6 Note that there is no carry to the - or blank digits. When the MODE key (7) is pressed in the up-count mode, the mode changes to the down-count mode, with the mode name displayed as shown in FIG. 81. The initial data is set in the same procedure as in the up-count mode, and the display at the end of the setting is shown in Fig. 82.

In both of these modes, data that is sequentially changed and imprinted during photographing is displayed on the character display section (16).

When the MODE key (7) is pressed in the down count mode, the fixed data imprint mode is entered and the display state shown in 1 and FIG. 83 is entered. If you press the ENT key (9) below, @Figure 84, AD
When the J key (10) is pressed, the display state shown in Fig. 85 is displayed, and the data can be input as shown in Figs. When you change the settings and press the ENT key (9), the 8th
The state shown in Figure 8 will be obtained.

In this mode, the set fixed data will be imprinted unless the OPE key (8) or MODE key (7) is operated.

When the B&W7 function is selected by the FUNC key (6), the imprinting time for monochrome film is controlled. With this function, mode switching etc. cannot be performed, and the setting state of the imprint function is maintained. When this function is selected, it is an imprinting function for monochrome film, and if the B&W7 function is not selected, it is an imprinting function for color film. It should be noted that when the B&W 7-inch button is selected, the imprint function may be disabled so that the same operation as the 77-inch imprint button can be performed. When the B&W7 angle is selected, the imprinting time becomes longer.

Next, the INTERVAL function will be explained. This function allows the camera to be activated at certain time intervals to automatically take pictures in sequence. In addition to the above-mentioned interval 7r, the interval time, the number of 7 frames at the time of each internoil shooting (hereinafter referred to as the number of 7 frames), the number of repetitions of the interval (hereinafter referred to as the number of groups), the internoil The first release start time for shooting (hereinafter referred to as start time) can be set.

FIG. 89 shows the mode name display for the interval 7 movement. It is in a non-execution state, and the ENT key (9) is disabled. Further, the graphic display section (24) is in a non-display state in this function. When the interval 7 action OPE key (8) is pressed to enter the execution state, execution starts toward the start time. Also, if you want to immediately execute the first Lurise of the interval, press the OPE key (8) to activate it, then release the camera to cancel the start time and start. . Next, by pressing the ADJ key (10), the 0UTPUT display changes to the INPUT display, and as shown in FIG. 90, a display state in which the interval time can be set is first entered.

The character display section (16) displays "1" for INTERVAL time, and "H (Hour L M (Minute) w S (Hour L M (Minute) w S (
The characters "Secord)" are displayed together with the numerical value.

In addition, the underlined values are displayed where they can be changed, and
Change the numerical value using the P key (11) or the DOWN key (12), move the changed point using the cursor key (13), and set the interval time (Figure 91).
, the interval time can be set from 0 seconds to 99 hours, 59 minutes, and 59 seconds. Next, by pressing the ENT key (9), the number of 7 frames (“F”) and the number of groups (
The setting display changes to “G”). Press the UP key (11) or DOWN key (12) for the underlined value.
, move the change position using the cursor keys (13), and set the number of 7 frames and the number of groups (Fig. 93).

The number of 7 frames can be set up to a maximum of 97 frames, but when the BRACKET7 function is in the execution state, priority is given to the number of 7 frames in the BRACKET7 function. The number of groups can be set up to 99 groups. Next, by pressing the ENT key (9), the display changes to the start time setting display as shown in FIG. The start time can be set to any day, hour, or minute. 5TART on the character display section (16)
"S" for time will be displayed, and "D (Date), H (Hour), M (M
1nute)" will be displayed together with the numerical value. Press the UP key (11) or D to select the underlined numerical value.
Change with the OWN key (12), move the changed point with the cursor keys, and set the start time. Next, ENT
By pressing the key (9), the character display section (16) changes to display "COMPLETED" indicating that the setting is completed (figure omitted), then by pressing the ADJ key (10), the I NPUT display is changed to the mode name display again. (Figure 95). As a result, if you want to start the interval function, press the OPE key (8) to put it into execution mode, and then press the ENT key.
When the key (9) is pressed to display 0UTPUT, the start time is displayed on the character display section (16) as shown in FIG. After the first release of the interval is executed, the character display section (16) displays the remaining time until the next release ("H, M, S").
') (Figure 97).

FIG. 98 is a block diagram showing a specific example of the buck circuit (BCKC). (CMC) is a control microphone, which manually controls the 77-inch scale, mode, and data settings, exposure calculations, creation of display data, creation of imprint data, and imprinting operations.

Furthermore, display sections (DMC) and (SD), which will be described later,
, (DD).

It also controls (CD), exchanges data with the calendaring microcomputer (CAMC), and exchanges data with the camera body (BD). It also controls the long exposure time (long time).

Switch (M) is a switch that is closed by pressing the memory key (14) in Figure 5, switch (CL) is a switch that is closed by operating the memory clear key (15), and (CUR) is a cursor. Switch that is closed by operating the key (13), (E N T ) is the enter key (9)
The switch that is closed by the operation of (up) is the up key (
The switch (DWN) is closed when the down key (12) is operated. These six switches are connected to each input port of the control microcomputer (CMC), and are also connected to the AND circuit (A
G) is connected to the interrupt terminal (rNTB).

Therefore, even if the control microcomputer (CMC) has stopped operating, when any switch is turned "ON", the control microcomputer (CMC) starts operating. In addition, the switch (O
PE) is closed in conjunction with the operation of the operation sink key (8). The switch (FUN) is a switch that closes in conjunction with the operation of the function key (6).
ADJ) is a switch that is closed in conjunction with the adjustment key (10), and (MOD) is a switch that is closed in conjunction with the operation of the mode key (7). These four switches are connected only to the input ports of the control microcomputer (CMC), so even if these switches are turned "ON", the control microcomputer (CMC) is not activated.

Next, the operation of the control microcomputer (CMC) will be explained based on the 70-chart of the control microcomputer (CMC) in FIG. 99. First, from the camera body (BD) to the signal line (C3B
) falls to "Low", the interrupt terminal (INTA) starts the operation from the No and O steps. first,
Since the camera has been activated, set the signal line (BSI) to “Hi”.
gh”, then enable interrupt operation using the interrupt terminal (INTA), and then determine at what timing the interrupt signal was input from the camera body (BD).
In step 2, it is determined whether the system is in a state of waiting for data input.

If it is in the state of waiting for data input, it is determined in step No. 3 whether imprint data (Tv, Av) or calculation data has been input. This is because, as mentioned above, when the signal line (CSB) falls to "Low", the signal line (BIO) becomes "High" for calculation data and "Low" for imprint data. When it is determined that imprint data is input, the sent data is read and it is determined in step N005 whether or not the ear side function has been selected. If it is determined in step N005 that the ear function is not selected, the process moves to step No. 15 without performing the ear movement.On the other hand, if the ear function is selected, the process moves to step 6. , and sends data according to the selected shooting mode to the LED drive circuit (LDR).This operation is performed by sending a synchronization signal to the signal line (C3LD) and sequentially sending data 4 bits at a time. Then, connect the signal line (LDEN) to “LoI11”.
When the display operation of the drive circuit (LDR) is activated, the light emitting diodes (LED) of the segments are dynamically driven in accordance with the image data, and image data is performed.

The control microcomputer (CMC) then adjusts the time according to the film sensitivity read from the camera body. In addition, when using the black and white function, different times are counted even if the read film sensitivity is the same data as the 7th Anximin image. When the count ends, the signal line (LDEN) is set to "High" to stop the display operation by the drive circuit (LDR).

Note that when the trailing curtain starts running in the camera body (BD), a "Low" pulse is output to the signal line (C8B). Therefore, at this time as well, an interrupt signal is input to the interrupt terminal (INTA), and since data input is not being waited for at this time, the process moves to step 11 (No). And No, 1
If it is determined in step 1 that the ear side movement is in progress, N
o, move to step 10 and connect the signal line (L D
E N ) is set to "High" to forcibly stop the ear motion.

This prohibits the edge motion from being performed even during film winding. In step No. 15, it is determined whether the switch (SCN) on the camera body is "ON". If the switch (S CN ) is “ON”, then No, do not perform the operations in steps 16 to 21.
o. Move to step 40.

On the other hand, if the switch (SCN) is "OFF", then it is determined whether the count-up mode is in effect. If it is the count-up mode, "1" is added to the register CR in which the imprint data is set, and the process moves to step 40 (No). On the other hand, if the mode is not the count-up mode, it is then determined whether the mode is the count-down mode. Then, if the countdown mode is selected, subtract 1'' from the contents of register CR and select No.

Move to step 40. On the other hand, if it is not the countdown mode, then it is determined whether it is a bracket function or not, and if it is a bracket function, it is set as a bracket)77
Register BR in which the number of frames of the link is set
Subtract “1” from and get No.

If it is not a bracket function, the answer goes to step 40, and the process goes to step 40.

Note that data processing is performed even when the switch (SCN) is "ON";
N) is set between steps No, 4 and No, 5, and if the switch (SCN) is “ON”, it is immediately No,
Alternatively, the process may proceed to step 40.

No, step 3 indicates that the data is not imprinted (signal line (
BIO) is “High”), N
o, the process moves to step 25, and data is read from the camera body. If the exposure function is selected, the process moves to step No. 27 and waits for the signal line (BIO) to become "Lou+". Then, when the signal line (BIO) becomes "Lou+", back I CP ("80 H") is output. Camera body (
BD) is connected to the signal line (B) when this back TCP is input.
IO) to “High” and the signal line (C3B) to “
Wait for the control microcomputer (CMC) to perform calculations while remaining at "Low", and when enough time has elapsed for the calculations to be performed, set the signal line (BIO) to "LOIII".Control microcomputer (CMC) Then, in step No. 28, output the back ICP and perform the operation of the exposure calculation subroutine. Then, when the calculation operation is completed, wait for the signal line (BIO) to become "Lou+", and then output the back ICP to "Low".
When this happens, data such as the aforementioned IIJ control data (Tv, Av), exposure control mode, non-interlocking, release enabled/disabled, etc. are sent to No. 40 Ste/knob.

When activated by a pulse output to the signal line (C3B) at the time the camera body (BD) starts operating, or when a pulse is input at the time the rear curtain starts running, the shooting 7 angle is activated. Otherwise, if the imprinting operation has been completed, the process immediately proceeds to step 40 (No).

Switches (M), (CL), (CU R), (E
NT).

(UP) and (DWN) are turned “ON” and an interrupt signal is input to the interrupt terminal (INTB), or the interrupt terminal (I
When the operation due to interruption by NTA) is completed, No, 40
Start the operation from step .

No. In step 40, reset the timer register (for counting operating time) TIR and set the 7-lag IOF, which determines whether to input or output data from the current microcontroller (CAMC), to "1"'. , move to step 42. No, 7 lag I in Step 7 of 42
Determine whether OF is “0” or not, and if it is “1”, read the data from the current microcomputer (CAMC) and
Reset the lag rOF to 0'' and move to step No. 47. On the other hand, if the flag IOF is 1'', then
If it is determined in step 42, the data is sent to the current microcomputer (CAMC), and the 7-lag IOF is 1" cented, and the process moves to step 47. The method of data exchange is the signal line. (CSCA) is set to "Low", and when outputting data, the signal line (Ilo) is set to "Low".
When inputting data to ow'', use the signal line (Ilo
) is set to "High". Signal line (C, S CA
) becomes “Lou+”, the current microcomputer (CAMC)
) is interrupted, and a pulse for data exchange synchronization is output from the current microcomputer (CAMC). In synchronization with this pulse, 4-bit data is sequentially transferred to the data bus (DBUS).
I). Curling microcomputer (CAMC)
) to the control microcomputer (CMC) are the current 1:01:1 on January 9, 2017, 9:01 until the start of the next shooting operation for interval shooting, and the data sent from the current interval i. There is data indicating whether the camera is operating or not, and whether interval shooting has finished. Therefore, II
The J control microcomputer (CMC) creates imprint data based on these data, and also creates data for displaying the remaining time until the start of the next shooting operation during the interval function, and also inputs the interval end signal. This will cancel the interval function. In addition to the control microcomputer (CMC), the curling microcomputer (CA)
The data sent to MC) includes the start date, hour, and minute of interval shooting, the hour, minute, and second indicating the interval of interval shooting, the number of groups for interval shooting, the number of frames for interval shooting, and settings in M/LT mode. Exposure time, whether interval function is selected, M/
There is data indicating that LT mode is selected.

1±Sui Sochi (M) ~ (M
OD) and determines whether a key operation is being performed. If no key operation is performed, the process immediately moves to step 50 (No). on the other hand,
If a key operation is performed, switch (M) ~ (MOD)
) and the state of the control microcomputer at that time.

In step 49, the signal line (BS, ) is turned low to start the camera body, and the process moves to step No. 50. This subroutine No. 48 is the 103rd and 104th subroutine.
The detailed operations are omitted since the relationship between the operation of each key, the setting data, and the display has already been described.

No. 48 step subroutine and no.

When the operation of step 49 is completed, the interrupt terminal (I NT
Enables reception of interrupt signals to A) and sends display data to the display microcomputer (DMC). In this operation, first, the signal line (DE N ) is set to ``Low'' and the display section (
DMC), (SD), (DD), (CD
) to the operating state, and then set the signal line (C3DM) to “L”.
ow” to notify the display microcomputer (DMC) that data will be output, output a synchronization pulse from the signal line, and send data 4 bits at a time.Each function,
The data sent and display depending on the mode will be described later based on the operation of the display microcomputer (DMC). In addition, although the enable terminal is used in the figure, when the signal line (DEN) becomes "LOLI+", the display parts (DMC), (SD), (CD), (D
D) is supplied with power.

When the data transfer is completed, in step 52, it is determined whether any of the switches (M) to (MOD) is set to "○N", and if it is set to "ON", the register TIR is reset. However, if none of the switches are turned on, add 1'' to the contents of register TIR and set N.
o, proceed to step 55. Then, in step 55, it is determined that the contents of the register TIR have reached a certain value "K", and if it has not reached 'K', then No,
Move to Step 42 and repeat the same action. And no.

When it is determined in step 53 that the contents of the register TIR have reached K'', the key operation or the camera body (
This means that a certain period of time has passed since data exchange with the signal line (D
E N > is set to "High" to stop the operation of the display section, enabling operation by an interrupt signal to the interrupt terminal (INTB) and stopping the operation.

Minnl'71+ Drink QQI"7'lnu FJ,'
)Q Epithet ``Bamboo → Go IL-chin'' 70
-It is a chart. First, determine whether the bracket function is selected, and if it is not selected,
7. Reset the lag, and if selected, determine whether the bracket function is being operated,
If not in operation, set A7 lag. And A7
After resetting or setting the lag, the camera body (BD)
Calculate the Ev value using the data from.

On the other hand, if the bracket)7y union is in operation, the EV value determined at the start of the operation is not changed, so the process moves to the bracket calculation operation.

Once the current Ev value is determined, the meter (MET
) has been imported, and if it has been imported, it is set as an external function and the meter (ME
The data from T ) is used as the control value. Note that when the control limit is exceeded, the limit value is used as the control value, similar to the calculation in the camera body (B D ). Meter (MET)
), then it is determined whether the mode is M or M/LT mode, and if it is in this mode, the manually set Tv and Av are output. On the other hand, M, M/LT
If it is not the mode, then it is determined whether the multi-function is selected, and if the multi-function is selected, the control Ev is selected based on the stored Ev value.
Calculate the v value.

A subroutine for this multi-function calculation is shown in FIG. 102. In the center mode, the maximum E vIllax and minimum Evmin are calculated from the stored Ev values, and from these two values (E vmax +
The control Ev is obtained by performing the calculation Ev+n1n)/2. If it is not the center, it is determined whether it is highlight mode, and if it is highlight mode, the stored Ev
The maximum value of Evmax-2, 3 is calculated to calculate the control Ev. If it is not highlight mode, then it is determined whether it is shadow mode or not, and if it is shadow mode, Ev+a is set to the minimum value of Ev stored Ev+ain.
The calculation of in+ 2 and 7 is performed to calculate the control Ev. If it is not the shadow mode, it is the average mode, and in this case, the calculation is performed to calculate the control Ev.

In FIG. 100, when the multifunction is not selected, the Ev from the camera is set as the control Ev.

Then, based on the obtained control Ev, P , , P 2
．． Calculation is performed according to the selected mode among P, , A, and S modes. A specific example of this calculation subroutine is shown in FIG. This calculation is first performed as E vmax (= T vn+ax+ A vmax)
< E VtE vmin (= T v+nin+
When A vmin) > E v, the control interlock is out, so the limit value is set as the control value, the out-of-interlock flag is set, and the process returns to the main routine.

On the other hand, when the interlock is in effect, the operation is performed in the order shown in the chart 70, the control value is calculated, the out-of-interlock flag is reset, and the process returns to the main routine (FIG. 100). In addition, in the camera body (BD), when the calculated value exceeds the control limit, the limit value is used as the calculated value and the set value is output as is, but in the back circuit, the limit value is used as the set value, and then Ev The set value is changed by recalculating from the limit value. Also, when in program mode,
It is now possible to set the limit aperture value (not the maximum aperture value or the maximum aperture value).

When the control T v and A v are determined, 7 lag A is “1”
If it is set to ``1'', it means that the bracket function is selected and no calculation is being performed, and the operation shifts to the calculation operation for brackets.Also, while the bracket function is in operation,
The process moves on to calculation for bracketing for the next photograph. first,
It is determined whether the mode is M or M/LT, and if the mode is M or M/LT, the amount of shift of the fringe value is shifted by the number of 7 frames (the number of times of next shooting) and the A7 lag is reset.

On the other hand, P,,P2. In the P, A, and S modes, Ev is shifted by the number of frames, the A7 lag is reset, and the process moves to the calculation subroutine for T v and A v.

When Tv and Av are calculated in this way, the bracket function is selected, and shooting for the set number of frames is completed, and if the signal line is "LoIll", no shooting operation is performed. In order to do so, a release disable signal is set, and if the above conditions are not met, the release disable signal is reset and the process returns to the main routine.

FIG. 105 is a 70-chart showing the operation of the current microcomputer (CAMC). First, when the signal line (IP) in the camera body (BD) is set to Low at the start of exposure control operation, the interrupt operation by the interrupt terminal (rNTA) starts.Then, in step STI, the timer interrupt (lse
In ST2, it is determined whether the switch (SCN) is "ON" or not, and if it is "ON", the interval, M/LT The process moves to step 5T20 without performing the above operation. On the other hand, if the switch (SCN) is "OFF", it is determined whether interval photography is being performed, and if it is not interval photography, then it is determined whether M/LT mode is being used.

In M/LT mode, the signal line (B S 2
) to “Lou+”, and if it is not M/LT mode, go to main step 2. Step ST2 (When it is determined that interval shooting is being performed at step Sr3,
Reset the remaining time until the start of interval shooting and set the signal line (BS2) to "Low" 6. Then, 7. Subtract 11" from the register IFR where the number of frames is set, and if there is no register rFR, set " If it is not 0", proceed to step 5T206. On the other hand, the register IF
If the content of H is "O", then '1' is subtracted from the register IGR in which the group number is set, and it is determined whether it has become '0'. Then, if it is '0', it sets the interval end signal, and if it is not 'O', it sets the remaining time.Then, it determines whether it is in M/LT mode or not. If not, close the signal line (BS2) to “High” and connect the M/LT
In mode, the signal line (BS2) is “Low”
The process proceeds to step 5T20 without changing the state.

Then, interrupts to the interrupt terminals (INTA) and (INTB) are enabled, and it is determined whether the 72-g TIF is "1" or not. If the 7-lag TIF is ``1'', it means that a timer interrupt occurred during this operation, and the TIF is reset to ``0'' and the operation moves from step 5T45.On the other hand, the 7-lag TIF is ``0''. ”, the operation will stop.

When the control microcomputer (CMC) sets the signal line (C8CA) to "Low" for data exchange, the calendar microcomputer (CAMC) outputs the interrupt terminal (INT) from 5T25.
Perform the operation according to B). 5T25 enables timer interrupts and largely determines whether to output or input data by determining the state of the signal line (Ilo). If data is input, the control microcomputer (C
Read data from MC). Then, if the M/LT mode is selected and the M/LT mode is not in operation, set the exposure time data, and if the M/LT mode is not selected or counting is in progress in the M/LT mode, leave it as is.
Proceed to step r30. In step 5T30, it is determined whether the interval function is selected and the machine is in a busy state. If the interval function is not selected or is in operation, leave it as is, 5T2
Move to step 0. On the other hand, if the interval function is selected and the operation has not started, set the number of frames in register IFH, the number of groups in IGH, the time interval between groups (remaining time), and start time, and proceed to step 5T20. Transition. 5T26
When it is determined that it is data output in step 5, the data mentioned above is sent to the control microcomputer (CMC).
The process moves to step T20.

When a timer interrupt occurs every second, step 5T40.41
The operation starts from the interrupt terminal (INTA), (INT
If the operation according to B) is in progress, the 7-lag TIF is set to "1" and the process returns to the previous operation 70-. On the other hand, if such operations are not performed or if their (INTA), (
When the operation in step 5T45 is completed, the operation starts from step 5T45. In step 5T45, the calendar is rewritten by increments of 1 second.

And check whether M/LT mode is working or not.
1211 + fM+I 6-1-f Ru 1h
/T, DASFU) h1 timer "1" is subtracted, and it is determined whether the Tv timer has reached "0". If it is not “O”, proceed directly to step 5T62,
(INTA).

(INTB), enables timer interrupts and stops operation. On the other hand, if the content of the Tv timer is "0" in step 5T48, the signal line (BS2) is set to 'H'.
igh”, the rear curtain starts running in the camera body (BD), and the process moves to step Sr62.

If it is determined in step 5T46 that the M/LT mode is not in operation, then it is determined whether or not an interval photographing operation is being performed. Then, if it is not interval photography, the signal line (BS,) is set to "High" and the process moves to step 5T62.

This is because the operation key (8) may be operated while the M/LT mode or interval function is in operation, resulting in a non-operation (stopping of operation) state. In this case, M/LT closes the signal line (BS2) to "High" to stop the interval and stops the exposure control operation of the camera.

When it is determined in step 5T55 that the interval 77 interval 1 is selected, the process moves to step Sr16, and it is determined whether it is 1 minute before the start of one group shooting, and if it is 1 minute before, the signal -y is In (BS,) to L ou
+" pulse is output to start the camera body (BD) and start the boost operation of the 7 runcillator (FL). In this case, the signal line (BS2) is connected to the "HiF" pulse.
ih'' is output, so the time until the start is calculated and the process moves to step 5T62.On the other hand, if it is determined in step Sr16 that it is not 1 minute before, the dog is instructed to take a picture of one group. It is determined whether it is the start time or not, and if the start time has been reached, the signal line (B
Set S2) to "Low" and proceed to step 5T62. On the other hand, before or after the start, it is determined whether "Low" is output to the signal line (BS2), and if "Low" is output, one group is in the shooting operation, so the 5T62 is immediately activated. On the other hand, if "High" is output to the signal line (B S 2), it means that the shooting operation for interval shooting is not started or the group is open, and in this case, the remaining time until the start is is calculated and the process moves to step 5T62.

Next, display microcontroller (IliC), LCD segment
Driver (SDL LCD common driver (CD), L
CD drive reference power supply (DD), liquid crystal display fls (L C
A graphic display block constructed by D> will be described. First, the control microcomputer (C
Based on the transfer lock (DCK2) from MC) Table 2
The data (4 bits) shown in is the data bus (DBUS2).
The data is transferred to the display microcomputer (DMC) via the display microcomputer (DMC), where it is converted into graphic display data and serially transferred to the LCD segment driver (SD). The LCD segment driver (SD) has built-in RAM for LCD display.
The 1-bit data corresponds to 1 dot of the liquid crystal display (LCD), the non-light, and the alpha light.The data for graphic display is transferred to the LCD segment driver (SD), and then the data for the LCD display is transferred to the LCD segment driver (SD). The LCD segment drive signal (S) is stored in the RAM and corresponds to the contents of the LCD display RAM.
G T ) is applied from the LCD segment driver (SD) to the liquid crystal display (LCD). The LCD common driver (CD) uses a built-in oscillator to generate timing signals necessary for display, and also drives the LCD common driver (LCD).
The LCD common scanning signal (CMT) that automatically scans the common signal in accordance with the display duty is transmitted to the liquid crystal display section (
LCD).

The LCD segment drive signal (SGT) and the LCD common scanning signal (CM T ) are transmitted through the LCD common driver (C
Synchronization is achieved by a synchronization signal (H8) supplied from D) to the LCD segment driver (SD). The liquid crystal display (LCD) uses these two signals, namely the LCD
The reference power supply (DD) for driving the LCD, which performs dot matrix graphic display using the segment drive signal (SGT) and the LCD common scanning signal (CM T ), is as follows:
A stable power source (VDP) for driving the liquid crystal display (LCD) is supplied to the LCD segment driver (SD) and the LCD common driver (CD).

Therefore, the general operation until the graphic pattern is displayed on the liquid crystal display (LCD) will be described in more detail below with reference to the 70-chart of the display microcomputer (DMC).

First, from the control microcomputer (CMC) to the display microcomputer (DM)
The display microcomputer (DMC) starts operating by the signal line (DEN) to C), and the supply of power is started.) The reset routine shown in FIG. 106 is started (step 2). In step 2, the LCD segment driver (SD) is initialized, and the LCD segment driver (SD) is initialized.
D) is turned off (all lights out) in six steps (2) to determine whether the mode is all lighting mode or not, and normally the interrupt standby state is entered in step (2). All this, r:! , to determine whether the light mode is on or not,
This is for a disconnection test at the factory, and when in full lighting mode, all lighting data is output to the LCD segment driver (SD) (step ■), and step
CD) and stop the system clock in step ①. Normally, that is, when not in full lighting mode!
＋ ふ歂、、1′ 帛执卋;λQianhin(Instinct L~I+bxn
Wait for an interrupt from the Zhu 11 Xiang microcomputer (CMC). The imprint routine shown in Fig. 107 is to set 7 lags to display surface water during imprinting (“IMP”) for a certain period of time during imprinting, and is started by the imprinting signal (IP) from the camera. step ■),
Save the register in step ■, and “IMF” in step [phase].
``After setting the display flag, the register is restored in step 0, and the original main routine is returned in step @.

Figure 108 Main routine is performed by the control microcomputer (CMC)
Signal (C6DM) from to display microcontroller (DMC)
In step ■, restarting of the main routine is prohibited until all processing in the display microcomputer (DMC) is completed, and in step ■, the control microcomputer (CMC) shown in Table 2 is restarted. Input the transfer data from , and check the power supply voltage in step (3). If the power supply voltage is less than a predetermined value, in step O, set the power supply voltage check flag (B, C, 7 lag).

In steps 0 to 29, the control microcomputer (CMC)
Decodes the data transferred from the computer into graphics display data.

This decoding is performed first [this character display part Fig. 6-(1
6) is carried out (step ■, mode name display, I
NPUT display and 0UTPUT display are converted into graphic display data by referring to the table corresponding to each display content, and this data is output to the LCD segment driver (SD) and displayed on the LCD in this LCD segment driver (SD). The data is written to the display RAM (step ■). Subsequently, the index indicating the range from control and the mode display section (18) in FIG. 6 are decoded in step Φ and output to the LCD segment driver (SD) (step 21).

Next, the index showing the shutter speed value, Fig. 6-(22
) and an indicator indicating the aperture value, Fig. 6-(23), and a symbol indicating that each of the 7 angles is in the execution state, Fig. 6-
(21) is decoded into graphic display data (step 22). In step 23, the B, C, and 7 lags determined in step ① are tested, and if the B, C, and 7 lags are positive, the battery check display (B, C, and 7) is shown in Figure 6-(24). , display) (Step 2
4). If B, C, and 7 lags are not set, depending on which function is selected on the external display, the calculation corresponding to that function is performed in step 25, and furthermore, this 7 lag is also decoded. Step 26), Step 22
-26 graphic display data are output to the LCD segment driver (SD) in step 27. Here, there are two calculations corresponding to the function selected on the external display in step 25, which will be explained in detail.

When the exposure function is selected first, in order to draw the Ev line (25) in FIG. 6, the appropriate aperture value for each shutter speed value is determined while sequentially changing the shutter speed value. After that, change the exposure mode (PI, P2゜P, , S, A, M, M/
LT) according to the setting line, Fig. 6-(26) to 10th
In the procedure from Figure 9 to Figure 114, in Figure 109, the minimum aperture value of the lens AVInaXs, the maximum aperture value of the lens Av+l1ins, the set limit value Avn on the minimum aperture side of the lens, the set limit value Avm on the open aperture side of the lens, Assuming that the selected slope is Avp, the procedure shown in FIG.
Draw AVy while changing vx. To explain briefly, first, in step ■, set Tvx=-0,5,
A line segment is drawn in step ■, then line segments ■ to ■ are drawn while Tvx is incremented (steps ■ to ■), and finally a line ■ is drawn as T vx=T v+aax (step ■).

P,,P2. Setting line in P co-mode, Figure 6-
The calculation of (26) is above, but the slope of P and the AVp line in P mode, Figure 109 - line segment ■ is 2:1.
Since the ratio is 1:2, when drawn in the same way as in P2 mode, the slope becomes step-like and difficult to understand. So Pl and P,
In the mode, this point is devised so that the points (T vxv A vy) obtained by calculation are lined up in a - straight line (see Figures 6 and 8). Figure 111 shows how to draw a setting line in S mode. While incrementing Tvx with Tvn■, draw a line (line segment ■) of A vy = A vmin, then draw a line of T vx = T vn. (line segment ■), and draw a line segment ■ with Tvx=Tvn (step ■).Finally, while incrementing Tvx again, draw a line (line segment ■) of A vy = A v + aax.

FIG. 112 shows how to draw a setting line in A mode, and Avn is the setting aperture value. T at step ■～■
Set vx”-0,5, draw a line segment ■, and draw T at step ■.
While incrementing vx, draw the line (line segment ■) of A vy= A vn with step ■ T vx=: T
vmax and draw a line segment ■. Figure 113 shows how to draw a setting line in M mode and M mode. While incrementing Tvx in steps ■ Step ■ )
Then, as Tvx=Tvn, a line (line segment ■) from A vy''A vmin to A vy=A vmax is drawn. Here, A Vnt T vn are the set aperture value and the set shutter speed value, respectively.

Figure 114 shows how to draw a setting line in M/LT mode, setting Tvx”-0,5 in steps
While incrementing the line (line segment) from = A vmin to A vy = A vn + ax to Tv in Step 2, add the line (#) of A VV = A vn.
1 minute ■) 6 In addition, the M/LT mode setting line can be drawn using exactly the same procedure as the M mode. The above is the calculation method of the graphic display section in exposure 7 anximin.

Next, we will discuss the calculations on the graphic display section when the multi-7 function is selected on the external display. At this time, it already indicates the range from control to -6 to +
The index No. 6 (hereinafter abbreviated as ΔEvx) is decoded so that the liquid crystal display (LCD) lights up in the step [phase] of FIG. 108, and the index indicating the shutter speed value, FIG. - (22), index indicating aperture value, Fig. 6 - (23) is decoded to turn off the light 1 In Table 4, the automatically controlled Ev value is Evc, the Ev currently being measured is Ev, , the number of stored data is 1
Then, αP, which is currently being photometered in step ① in Figure 115
0(ΔEvo, yo) and then plot the line L0 (step ■). Plot the two points (ΔEvn+ym) stored in step ■. However, 1≦
■≦8, 2≦Kou≦9. This situation is shown by a 70-chart in FIG. 115, where 0 or more is the calculation method of the graphic display section in the multi-7 anx.

Next, the operation of the graphic display section when the bracket function is selected on the external display will be explained. Indicator indicating the amount of deviation from proper exposure -6 to +6
is the same as the multifunction system, step 108 [
phase] is decoded so that the liquid crystal display (LCD) lights up.

In Table 4, if the current point is ΔEvCONT, the setting start, and α is ΔEvSET, then! @116 Figure step ■, Δ
Find E viax, and in step ■, ΔEvx=ΔEvS
The line from ET to ΔEvx=ΔE vw+ax (L
SET), and in step ■, ΔEvx = ΔEvCON
Line from T to △Evx = ∆E vmax (LCO
NT). This is how to calculate the bracket function in the graphic display section.As described above, when the calculations in the graphic display section are completed, the process advances to step 26 in Figure 108, and it is shown which function is selected on the external display. The symbol shown in FIG. 6-(20) is decoded and outputted to the LCD segment driver (SD) in step 27 together with the decoding result in step 22 and the calculation result in step 25. In steps 28 and 29, "I" indicating that imprinting is in progress is performed.
MP''7 lag is tested, and if set, decodes ``IMF'' into the subcharacter and outputs it to the LCD segment driver (SD).

In this way, when all the graphic display data is decoded and serially transferred to the LCD segment driver (SD), the liquid crystal display (LCD) is turned on (step 30), and the display microcontroller (DMC) is turned on. Processing 1 loop ends. Then in step 31,
Interrupt signal (C3DM) from control microcomputer (CMC)
After entering the standby state, when the interrupt signal (C6DM) is sent again, the display microcomputer (DMC) starts processing for the next graphic display from Step 108 in Figure 108. That's why there is.

As described above, a graphic pattern is displayed on the liquid crystal display (LCD) according to data sent from the control microcomputer (CMC) to the display microcomputer (DMC).

In addition, in the buck circuit (BCKC) shown in FIG. 98, power is supplied to the karengaifun from two 3-volt power batteries (B), and the control and display microcomputer (CMC),
(DMC) is powered by four 6-volt power batteries (A). The battery check by the display microcomputer (DMC) checks both the power batteries (A) and (B).

When the power supply battery (A) is full, the symbol (A) is displayed on the graphic display section (24) as shown in Fig. 117.
and four batteries are displayed, and when the power source battery (B) is not working, the symbol (B) and two batteries are displayed as shown in FIG. 118.

Here, P, a line with a slope in mode (Fig. 109A
To explain how to draw (vp), the method of displaying a line with a slope of shutter speed value: aperture value = 1:2 is as shown in Figure 119 (a), (b), (
There are three possibilities c). That is, in this embodiment, the minimum display step of the liquid crystal display (LCD) is 0.5 Ev steps in both the shutter speed direction and the aperture direction, so a point is always displayed every 0.5 Ev step of the aperture value. Then, it can be displayed as shown in FIG. 119 (,) or (b). The difference between FIGS. 119(a) and 119(b) is due to the shutter speed value and the rounding of the aperture value during display.

If displayed in this way, it is extremely difficult to understand the slope of shutter speed value: aperture value of 1:2 in P1 mode. Therefore, in this embodiment, as shown in FIG. 119(e), only the points for each IEv step of the aperture value are displayed,
The points in between are not displayed. This results in
The slope of the aperture value relative to the shutter speed value is clear.

For exactly the same reason, the display as shown in FIG. 8 is used in the P mode.

Next, how to draw the Ev line (25) in FIG. 6 will be explained. In this embodiment, the display range of the liquid crystal display (LCD) is set such that the shutter speed value is Tv≦11 and the aperture value is Av≧0.5, but Tv≦−0°5 and Av≧
9.5, both are represented by the index "En II s Hn, so they are not accurate.

Therefore, the Ev line is Tv≦-0,5 and Av≧9.
5, it is not displayed, and 11≧Tv≧0°0.5≦Av<9.
Only the range of 5 is displayed.

However, the setting line (Fig. 6-(26)) is Tv≦11°Av
Displayed in the range ≧0.5. By doing this,
Setting line Figure 6-(26) and Ev line Figure 6-(2
5), the control points are: shutter speed value 11 ≧T v ≧Ot aperture value 0.5≦Av≦
Only the exact range of 9.5 is displayed.

A specific method of drawing the Ev line is shown in Fig. 120.

In this figure, first, in step (2), the TV is initially set to =O (15ec), and in step (2), Avy=Ev-Tvx is determined. However, Ev is the data No. 14 to 15 in Table 2, which is automatically controlled.
This is the value sent from the control microcomputer (CMC). In step ■, it is determined whether 0.5≦Avy<9.5 (1,2≦F<27), and if it is within this range, it is a point) (T vxt A
If the value is outside the range, do not plot. In step ■, Tvx is incremented by IEv steps, and in step ■, Tvx>Tvmax (Tv=11) is determined, and N
If O, return to step (2) and repeat steps (2) to (2) below. And YES, that is, T v> T vma
When x is reached, proceed to step ■ and end. In addition, T
The step of incrementing vx may be 0.5Ev step.

In Figure 1, the control microcomputer (
BMC) is the serial input/output terminal (SOU L(S I
N), (SCK), all remaining circuits (
Flash device (FL), receiver (RFC), display unit (DSP), lens circuit (LEC), AF circuit (AF
C), back circuit (BCKC), A-D.

It exchanges data with the DA conversion circuit (ADA). Therefore, by monitoring this serial input/output terminal while the system is operating, checking the data read from the monitor, and comparing it with the operation of the camera system, you can determine whether or not the system is operating normally. Can be checked. Therefore, this series input/output terminal (S OU
), (S I N), (S CK) are the camera body (BD
) are the terminals (T I), (T 2), (T , ) for the back circuit (BCKC), and the terminals (T, , ), (T , ) for the lens circuit (LEC). , □).

There is (T,,). All the terminals are the back circuit (BCKC) terminal (T1
)t(T 2 ), (T 3 ), so the back circuit (
What is necessary is to make it possible to attach a checker at the position of BCKC).

Then, from the checker side, the microcomputer (BMC) outputs a "Low" signal with lower impedance than the "High" signal output to the signal line (C3B),
If the signal line (C3B) is forcibly kept at "Low", the gate circuit (G2) is always in an active state, so data exchange with circuits other than the back circuit (BCKC) can be checked. Also, check the back circuit (BCKC) by checking the lens circuit (LEC) terminals (T, 2), (T
,,) is possible to some extent.

In addition, the connection terminal (T, ) for the back circuit (BCKC).

(T2)-(T3) are located in the part covered by the back cover, and are located in positions that are difficult to see from the outside. Therefore, it is not necessary to provide the date circuit (G2) for protection, and as shown in FIG.
may be omitted. Even if the date circuit (G2) is omitted in this way, the buck circuit (BCKC) is still connected to the signal line (CS
There is no problem because data is exchanged only when B) is "Low". Furthermore, by doing this, when a checker device is installed at the position of the back circuit (BCKC), there is no need to forcibly set the signal line (C3B) to "Low".

Effects According to the present invention as described above, the flash device (FL) in the camera system, the register-1<-(RFC),
Display section (DSP), lens circuit (LEC), AF
circuit (AFC), A-D, D-A conversion circuit (A
Data exchange between A) and a control circuit such as a control microcomputer of the camera body can be checked or diagnosed from outside the camera while the camera is operating, and can be checked even when the camera is completed. Also, since the back cover terminal is used for checking, there is no need to provide a dedicated terminal for checking (
Economical.

Figure 1 is a block diagram showing the entire camera system to which the present invention is applied; Figures 2 and 3 are flowcharts showing the operation of the microcomputer (BMC) of the camera body (BD); Figure 5 is an external view of the back (BCK), Figure 6 is a display example of the display section (2) in P1 mode, Figure 7 is a display example in P2 mode, and Figure 8 is a display example in P3 mode. Display examples, Figures 9 to 18 are diagrams showing the relationship between key operations and display in P2 mode, Figures 19, 20, and 21 are diagrams showing the relationship between key operation and display in S mode. , Fig. 22, Fig. 23, 2nd
Figure 4 is a diagram showing the relationship between key operation and display in A mode, Figures 25 to 29 are diagrams showing the relationship between key operation and display in M mode, and Figures 30 to 35 are M/LT. Diagrams showing the relationship between key operations and displays in mode, Figures 36 to 41
The figure shows the relationship between key operations and display in multi-function average mode, Figures 42 and 43 show the relationship between key operation and display in center mode, and Figures 44 and 4
Figure 5 is a diagram showing the relationship between key operations and display in highlight mode, Figures 46 and 47 are diagrams showing the relationship between key operation and display in shadow mode, and Figure 48 is when returning to average mode. Figures 49 to 54 are multi-7T.
(Figures 55 to 68 are brackets) 77 This figure shows the relationship between key operations and the display when M mode is selected in the function, and the relationship between the shooting operation and the display in the function. Figures, tI & 69, and Figure 70 are diagrams showing the relationship between key operations and display in the exposure control data mode using the imprint function, and Figures 71 to 75 show the key operations and display relationships in the year/month/day mode. Figure 76 is a diagram showing the relationship between displays, while Figure 80 is a diagram showing the relationship between key operations and displays in up count mode, @Figure 81.
Figure 82 is a diagram showing the relationship between key operations and display in down count mode, Figures 83 to 88 are diagrams showing the relationship between key operation and display in fixed data mode, and Figures 89 to 97 98 is a block diagram showing the entire back circuit (BCKC), and FIG. 99 is a diagram showing the relationship between key operation and display and the relationship between shooting operation and display.
), Figure 100 is a 70-chart showing the operation of the calculation subroutine, and Figure 101 is P
, S, A mode operation subroutine 70-
102 is a 70-chart showing the operation of the multi-function calculation subroutine, and FIGS. 103 and 104 are the 70-chart showing the operation of the key manual subroutine.
0-chart, Figure 105 is a calendar microcomputer (CA
70-chart showing the operation of the display microcontroller (DMC), Fig. 106 is a flowchart showing the reset routine of the display microcontroller (DMC), Fig. 107 is a flowchart showing the imprint routine of the display microcontroller (DMC), and Fig. 108 shows the display microcontroller (DMC). 7 showing the main routine of (DMC)
a-chart, Figure 109 is a diagram for explaining how to display program lines in P mode, Figure 110 is a 70-chart showing the display power of program lines in P mode, Figure 111 is S mode. 70-chart showing the display power of the program line in mode A, FIG. 112 is a flow chart showing the display power of the program line in mode A, f
Figure JfJ113 is a 70-chart showing the display power of the program line in M mode, and Figure 114 is a 70-chart showing the display power of the program line in M/LT mode.
Figure 115 shows the display power of multi-function 7
0-Char), #fJ116 is a flowchart showing the display power of the bracket function, Figure 117,! 1
Figure 8118 is a diagram showing an example of the display when the 7!1 source battery is low, f
iS119 is a diagram showing an example of display in P1 mode, 12th
Figure 0 is a flowchart showing the display power of the Ev line, the first
FIG. 21 is a block diagram showing a modification of the camera system shown in FIG.

FL near rush circuit section, LEC: lens circuit section,
AFC: Automatic focus adjustment circuit, DSP: Display circuit, BCKC: Camera back cover circuit, BMC:
Control circuit section I of camera body I Tl to T3: Terminal for back cover Applicant: Minolta Camera Co., Ltd. No. 4 @ W46 Fig. 7 Fig. 7 Fig. 1θ Fig. 11 Fig. 1q Fig. 2θ Fig. 2/Fig. 17 figure
Figure 78 Figure 22 Figure 23 Figure 27 Figure 21 Figure 27 Figure 3θ Figure 37 Figure 34
Figure 35 Figure 46 Figure 32
Fig. 4θ Fig. 41 Fig. m 44 Fig. 45 Fig. 46 Fig. 32 Fig. 33 Fig. 37 Fig. 311 Fig. 42 Fig. 4 Fig. 47 Fig. 41 Fig. 4 D Fig. fρ Fig. 57 Fig. Figure 54
Figure 55 Figure 56 'IJJ5 diagram
Figure 6θ Figure 6/Figure 64 Figure 1
Figure 66 Figure 6z Figure 53 Figure f7 Figure 1 Figure 62 Figure 63 Figure 67 Figure 1 Figure 74 Figure 76 Figure 7 Da Figure
Fig. 1 ρ Fig. 27 Fig. 34 Fig. IS Fig. 16 Fig. 72 Fig. 73 Fig. 77 Fig. 7 / Fig. 12 Fig. 8 Fig. f7 Fig. 9 Fig. 32 Fig. D p Fig. 5 Figure 1 θ 4 Figure ノ θb @ j! /θ5 Figure 103 To, i snow convex wealth:, H1! 14 --・-1..., I-10. -14.・Figure 1/θ Figure 1//Figure 112 Figure 1/, Figure 5 Figure 7-6 Figure 1/7 Figure 1/3 Figure 1H Figure 0

Claims (1)

[Claims] 1. A plurality of circuit units, a control circuit that inputs data from the circuit units in time series, performs arithmetic processing, etc., and outputs the obtained data in time series; It includes a common data bus for exchanging data with the circuit section and a back cover terminal provided on the camera body for exchanging data between the camera body and the back cover, and is controlled from the plurality of circuit sections. A camera system in which data input to the camera is performed in chronological order, a data bus and a back cover terminal are connected, and operation can be diagnosed based on signals appearing on the back cover terminal. 2. The claims include a lens circuit section for supplying photographing lens data to the camera body, a circuit section for automatic focus adjustment, and a display circuit section for displaying various data in the plurality of circuit sections. The camera system capable of diagnosing operation according to item 1. 3. The plurality of circuit sections include a lens circuit section for providing photographic lens data to the camera body, a circuit section for automatic focus adjustment, a display circuit section for displaying various data, and a circuit section for flash photography. A camera system capable of diagnosing operation according to claim 1, including a flash circuit section for diagnosing operation.